Es ef ls lf in project management

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Developing the Schedule

5

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Teaching Strategies

The first vignette reinforces the need to interact with community members and key stakeholders when planning the schedule. Sometimes part of the solution of the project is the creation of other beneficial projects to help with buy in.
The second vignette reinforces that the first design of a project might not be the final plan. Complex projects require creative solutions to keep all the aspects on track and the project to be completed on time and within budget. Even though it had difficulties and a few failures at the start, the complex project was scheduled well.
Sometimes, when planning the schedule, calculated times are for activity completion are not accurate. This can become a problem when no one takes the time to examine the actual time it takes to complete activities.
Have students plan the amount of time that it would take to travel between two cities that are near campus. After they calculate the time to travel, have them think about how they would factor in extenuating circumstances (like a flat tire, the need to refill the fuel tank, the need to stop for food, or a traffic-blocking accident).
Have students calculate the ES, EF, LS, and LF times in class to be sure they understand what it means to calculate forward and to calculate backward.
The ES, EF, LS, LF times on the network diagram for the consumer market study are included in the chapter materials. Have the students compare the textbook diagram with the schedule table in Microsoft Project.
Have the students report on the similarities and the differences.
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Chapter Concepts

Estimating the resources required for each activity

Estimating the duration for each activity

Establishing the estimated start time and required completion time for the overall project

Calculating the earliest times at which each activity can start and finish, based on the project estimated start time

Calculating the latest times by which each activity must start and finish in order to complete the project by its required completion time

Determining the amount of positive or negative slack between the time each activity can start or finish and the time it must start or finish

Identifying the critical (longest) path of activities

Performing the steps in the project control process

Determining the effects of actual schedule performance on the project schedule

Incorporating changes into the schedule

Developing an updated project schedule

Determining approaches to controlling the project schedule

Implementing agile project management

Chapter Concepts

This chapter discusses monitoring and controlling the progress of the project, re-planning, and updating the project schedule.
Once a project actually begins, it is necessary to monitor progress to ensure that everything goes according to schedule. This involves measuring actual progress and comparing it to the schedule.
If at any time during the project, it is determined that the project is behind schedule, corrective action must be taken to get back on schedule, which becomes increasingly difficult as a project falls further behind.

Based on the material in this chapter, students will become familiar with:

Estimating the resources required for each activity
Estimating the duration for each activity
Establishing the estimated start time and required completion time for the overall project
Calculating the earliest times at which each activity can start and finish, based on the project estimated start time
Calculating the latest times by which each activity must start and finish in order to complete the project by its required completion time
Determining the amount of positive or negative slack between the time each activity can start or finish and the time it must start or finish
Identifying the critical (longest) path of activities
Performing the steps in the project control process
Determining the effects of actual schedule performance on the project schedule
Incorporating changes into the schedule
Developing an updated project schedule
Determining approaches to controlling the project schedule
Implementing agile project management
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Learning Outcomes

Estimate the resources required for activities
Estimate the duration for an activity
Determine the earliest start and finish times for activities
Determine the latest start and finish times for activities
Explain and determine total slack
Prepare a project schedule
Identify and explain the critical path
Discuss the project control process
Develop updated schedules based on actual progress and changes
Discuss and apply approaches to control the project schedule
Explain agile project management
Learning Outcomes

After studying this chapter, students should be able to:

Estimate the resources required for activities
Estimate the duration for an activity
Determine the earliest start and finish times for activities
Determine the latest start and finish times for activities
Explain and determine total slack
Prepare a project schedule
Identify and explain the critical path
Discuss the project control process
Develop updated schedules based on actual progress and changes
Discuss and apply approaches to control the project schedule
Explain agile project management
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Project Integration Management
Project Resource Management
Project Schedule Management
Project Management Knowledge Areas from PMBOK® Guide

Project Management Knowledge Areas from PMBOK® Guide

Concepts in this chapter support the following Project Management Knowledge Areas of the PMI Guide to the Project Management Body of Knowledge (PMBOK® Guide):

Project Integration Management

Project Resource Management
Project Schedule Management

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More than Wind Infrastructure Development in Kenya

Background

Up to 310 megawatts of clean power
€625 million wind farm
Feasibility studies
Transmission route determination
Clean water bore holes for livestock
Construct schools and medical dispensaries
Analysis and Solutions

Robust project planning
Viability
Sustainability
Schedule
Outcomes
Construct road
Relocate village
Construction Oversight
Private – windfarm
Government – transmission
Vignette A: More than Wind Infrastructure Development in Kenya

Expected to produce up to 310 megawatts of clean power to be added to the Kenyan grid, the €625 million wind farm’s schedule included such tasks as the feasibility of the area for the farm, determination of the transmission line route, completion of bore holes to access clean water for livestock, construction of schools and medical dispensaries, and numbers of meetings with stakeholders and subcontractors.

Robust project planning
Examined viability and sustainability to community
The schedule for the LTWP plan was not as simple as secure funding for the PPP, construct the wind farm, build the transmission line, and connect to the grid.
it was determined that a road was needed to be constructed through Marsabit, one of the most impoverished regions of Kenya, and a village would need to be relocated.
The private contractors in the PPP are providing oversight for the construction of the windfarm.
The government agency is providing oversight to the transmission line construction.
“The president of Kenya has been to the project site, and he’s made it clear how important this project is to the country. That support has filtered down through the community and has helped the project to progress.” The project has run smoothly from the start due to planning, relationships with stakeholders, and a well-designed schedule.

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Scheduling Terminal 5

Project Overview

Multiple designs were created
More than 20,000 suppliers
Made up of 16 major projects and 147 subprojects with costs from £1 million to £300 million
Each day, 8,000 workers reported and received 250 deliveries
Project Schedule

Think beyond the traditional methods
Constructed the roof structure offsite to test process and schedule
Delivered roof 3 months early and saved £5.5 million
Included systems testing for opening day
Had issues on opening day
Vignette B: Scheduling Terminal 5

T5 at London Heathrow Airport was designed and built to be the home for British Airways domestic and international flights and was projected to provide service for 30 million passengers annually. With plans for 62 aircraft stands, the complex design was positioned on a 260-hectare (2.6 million m2, 1.0 sq mile) site on the western end of Heathrow and was bordered by the northern and southern runways. Concourse A was planned as a four-story terminal building connected to a satellite building, Concourse B, by an underground people mover transit system. The plan also included the placement of a 4,000 space multi-story car parking garage, hotel facilities, and an air traffic control tower. Access to and from T5 included road links to the M25 motorway and an underground railway to the London Underground Piccadilly Line.

The project
Multiple designs were created before final plan submitted to planning commission.
The schedule for the construction was subject to 700 restrictions, including a requirement to divert two rivers for environmental standards.
The more than 20,000 suppliers for the project provided materials for the buildings, rails and tunnels, infrastructure, or systems.
The complete project was made up of 16 major projects and 147 subprojects with costs from £1 million to £300 million.
Each day, 8,000 workers reported to the site and received almost 250 deliveries per hour
Schedule
Think beyond the traditional methods for contracting and project performance.
Roof team constructed the roof structure at a location offsite first to test the process and schedule. The roof was delivered three months early and saved £5.5 million, much more than the £3.5 million to complete the prototype construction
Included systems testing to prepare the people and the processes for opening day.
Even though the Terminal 5 construction project seemingly had been delivered on time and on budget, not every system was ready for functionality upon opening. Finally, 12 days after its initial opening, Terminal 5 began its full flight schedule.

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Estimate Activity Resources

Resources include

People, materials, equipment, facilities

Influence on the duration

Availability of the resources

Types of resources

Sufficient quantities of resources for the activity durations

Potential conflicts with other projects may cause

Involve person with expertise in resource estimate

Estimates influence costs

Estimate Activity Resources

It is necessary to estimate the types and quantities of resources that will be required to perform each specific activity in a project.
Resources include people, materials, equipment, facilities, and so forth.
Having this information is essential in estimating how long it will take to perform each activity and the project as a whole.
A number of factors influence the duration of an activity:
Availability of the resources
Types of resources
Sufficient quantities of resources for the durations of the activities
Potential conflicts with other projects that may cause a delay
When estimating the types and quantities of resources required for each specific activity, it is valuable to involve a person who has expertise or experience with the activity.
Estimated activity resources will also be used later for estimating activity costs and determining the project budget.
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Estimate Activity Durations

Duration must be the total elapsed time

Time for the work to be done plus any associated waiting time

Estimate Activity Durations

Once the types and quantities of resources are estimated for each activity, estimates can be made for how long it will take to perform the activities.
The estimated duration for each activity must be the total elapsed time—the time for the work to be done plus any associated waiting time.
The figure above depicts the activity estimated duration for varnishing floors.
It is a good practice to have the person who will be responsible for performing a specific activity estimate the duration for that activity.
Builds buy-in from the person and generates commitments
Avoids bias that may be introduced by having one person estimate the durations for all of the activities
It is important to designate an experienced individual to estimate the durations for all the activities for which the organization or subcontractor is responsible in large projects.
Historical data can be used as a guide in estimating the durations of similar activities.
Estimated duration should be aggressive yet realistic.
Inflating estimated durations in anticipation of the project manager negotiating shorter durations is not a good practice.
Throughout the performance of the project, some activities will take longer than their estimated duration, others will take less time than estimated, and a very few may conform to the estimated duration exactly.
At the beginning of the project, it may not be possible to estimate the durations for all activities with a high level of confidence.
The project team can progressively elaborate the estimated durations as more information is becomes available to allow for more accurate estimated durations.
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Why is it a good practice to have the person who will be responsible for performing a specific activity estimate the duration for that activity?

Student Discussion

Why is it a good practice to have the person who will be responsible for performing a specific activity estimate the duration for that activity?

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Possible responses to Student Discussion

Builds buy-in from the person and generates commitments

Avoids bias that may be introduced by having one person estimate the durations for all of the activities

The designated individual uses experience to estimate the durations

Historical data can be used as a guide

Why is it a good practice to have the person who will be responsible for performing a specific activity estimate the duration for that activity?

As we just discussed, it is a good practice to have the person who will be responsible for performing a specific activity estimate the duration for that activity.

Builds buy-in from the person and generates commitments
Avoids bias that may be introduced by having one person estimate the durations for all of the activities
It is important to designate an experienced individual to estimate the durations for all the activities for which the organization or subcontractor is responsible, especially for large projects.
Historical data can be used as a guide in estimating the durations of similar activities on future projects.
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Explain the statement:
The estimated duration should be aggressive yet realistic.

Student Discussion

Explain the statement: The estimated duration should be aggressive yet realistic.

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Possible responses to Student Discussion

Durations should not be too short to try to win the contract

Inflated estimated durations is not good practice

Project manager may not be able to negotiate shorter durations

Some activities will take longer and others shorter durations than planned

As the project progresses, level of confidence for accuracy increases

Explain the statement:

The estimated duration should be aggressive yet realistic.

The estimated duration should be aggressive yet realistic means the following:

Inflating estimated durations in anticipation of the project manager negotiating shorter durations is not a good practice.
Throughout the performance of the project, some activities will take longer than their estimated duration, others will be done in less time than their estimated duration, and a few may conform to the estimated duration exactly.
At the beginning of the project, it may not be possible to estimate the durations for all activities with a level of confidence regarding their accuracy. Estimations may need to be refined as a project proceeds.
The project team can progressively elaborate the estimated durations as more information becomes available, to allow for more accurate estimated durations.
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Estimate Activity Durations

This figure depicts the network diagram for a consumer market study, with the estimated durations in days for each activity.

What are the realistic estimates for the activities shown?
What happens if an activity is delayed and will be its impact on the project?
What happens if an activity finishes early?
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Establish Project Start and Finish Times

Define the overall window for project completion

May not want to commit to a specific date

Project not start until customer has approved the contract

Delay in contract signing may impact project start

Set finish time as number of days from project start

Establish Project Start and Finish Times

It is necessary to select an estimated start time and a required completion time for the overall project. This is important in order to establish a basis from which to calculate a schedule using the estimated durations for the activities.

Define the overall window, or envelope, of time in which the project must be completed.
The contractor may not want to commit to completing the project by a specific date until the customer has approved the contract.
A delay in signing will likely impact the start date of the project.
The finish time should be stated as a number of days from the start of the project.
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Develop Project Schedule

Prior activities for schedule development

Estimate duration of each activity

Establish overall window of time for the project

Develop the schedule timetable

Earliest start and finish times based on estimated start date

Latest start and finish times based on required completion date

Develop Project Schedule

Once you have an estimated duration for each activity in the network must determine (based on durations and sequence) whether the project can be realistically finished by the required completion time.

In order to do this, the contractor should estimate the duration of each activity.
He or she should establish an overall window of time for the project.
Develop a project schedule that provides a timetable for each activity and shows:

The earliest times (or dates) at which each activity can start and finish, based on the project estimated start time (or date)
The latest times (or dates) by which each activity must start and finish in order to complete the project by its required completion time (or date)
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Earliest Start and Finish Times

Earliest start time (ES)

Earliest time at which a specific activity can begin

Earliest finish time (EF)

Earliest time by which a specific activity can be completed

EF = ES + Estimated Duration

Calculate forward through the network diagram

A. Earliest Start and Finish Times

Earliest start time (ES) is the earliest time at which a specific activity can begin

It is calculated on the basis of the project estimated start time and the estimated durations of preceding activities.
Earliest finish time (EF) is the earliest time by which a specific activity can be completed

It is calculated by adding the activity’s estimated duration to the activity’s earliest start time
EF = ES + Estimated Duration

Calculate forward through the network diagram from the beginning of the project to the end of the project.
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Rule 1:

The earliest start time for a specific activity must be the same as or later than the latest of all the earliest finish times of all the activities leading directly into that specific activity.

Rule 1:

The earliest start time for a specific activity must be the same as or later than the latest of all the earliest finish times of all the activities leading directly into that specific activity.

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Earliest Start and Finish Times Calculation

Why is the ES for “Dress Rehearsal” 10?

Earliest Start and Finish Time Calculation

This figures depicts the three activities that go into the production of a “Dress Rehearsal” for a play. You will note that “Practice Skit” has an EF of day 5; “Make Costumes” has an EF of day 10; and “Make Props” has an EF of day 4.
“Dress Rehearsal” cannot start until all three of these activities are finished, so the latest of the EFs for these three activities determines the ES for “Dress Rehearsal.”
The latest of the three EFs is day 10—the earliest finish time for “Make Costumes.”
Therefore, “Dress Rehearsal” cannot start any earlier than day 10. That is, its ES must be day 10 or later.
Even though “Practice Skit” and “Make Props” may finish sooner than “Make Costumes,” “Dress Rehearsal” cannot start because the network dependent relationships indicate that all three activities must be finished before “Dress Rehearsal” can start.
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“Identify Target Consumers”

Start date = 0
ES = Start date = 0
Duration = 3
EF = 0 + 3 = 3
“Identify Target Consumers”

In the following slides we will see the different activities and forward calculations that go into a consumer market study project.
The project estimated start date is 0 and the duration is three days.
Therefore, the earliest “Identify Target Consumers” can start is time 0, and the earliest it can finish is 3 days later (because its estimated duration is 3 days).
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“Develop Draft Questionnaire”

ES = EF Task 1 = 3
Duration = 10
EF = 3 + 10 = 13
“Develop Draft Questionnaire”

When “Identify Target Consumers” is finished on day 3, “Develop Draft Questionnaire” can start. It has an estimated duration of 10 days, so its ES is day 3 and its EF is day 13.
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“Pilot-Test Questionnaire”

ES = EF Task 2 = 13
Duration = 20
EF = 13 + 20 = 33
“Pilot-Test Questionnaire”

When “Develop Draft Questionnaire” is finished on day 13, “Pilot-Test Questionnaire” can start. It has an estimated duration of 20 days, so its ES is day 13 and its EF is day 33.
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“Review Comments & Finalize Questionnaire”

ES = EF Task 3 = 33
Duration = 5
EF = 33 + 5 = 38
“Review Comments & Finalize Questionnaire”

When “Pilot-Test Questionnaire” is finished on day 33, “Review Comments & Finalize Questionnaire” can start. It has an estimated duration of 5 days, so its ES is day 33 and its EF is day 38.
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“Prepare Mailing Labels,” "Print Questionnaire," "Develop Data Analysis Software," and "Develop Software Test Data"

ES = EF Task 4 = 38
Task 5
Duration = 2
EF = 38 + 2 = 40
Task 6
Duration = 10
EF = 38 + 10 = 48
Task 7
Duration = 12
EF = 38 + 12 = 50
Task 8
Duration = 2
EF = 38 + 2 = 40
“Prepare Mailing Labels,” "Print Questionnaire," "Develop Data Analysis Software," and "Develop Software Test Data"

When “Review Comments & Finalize Questionnaire” is finished on day 38, “Prepare Mailing Labels,” "Print Questionnaire," "Develop Data Analysis Software," and "Develop Software Test Data" can all start.
The ES for each activity is 38, but they each have different EFs.
“Prepare Mailing Labels,” has an estimated duration of 2 days, so its EF is day 40.
"Develop Data Analysis Software" has an estimated duration of 10 days, so its EF is day 48.
"Develop Data Analysis Software" has an estimated duration of 12 days, so its EF is day 50.
"Develop Software Test Data" has an estimated duration of 2 days, so its EF is day 40.
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“Mail Questionnaire & Get Responses”

Latest of Tasks 5 and 6 = 48
ES = EF Task 6 = 48
Duration = 65
EF = 48 + 65 = 113
“Mail Questionnaire & Get Responses”

When “Prepare Mailing Labels” and "Print Questionnaire" are finished, “Mail Questionnaire & Get Responses” can start.
The later of the two EF times for “Prepare Mailing Labels” and "Print Questionnaire" is 48, therefore this is the ES.
“Mail Questionnaire & Get Responses” has an estimated duration of 65 days, so its ES is day 48 and its EF is day 113.
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“Test Software”

Latest of Tasks 7 and 8 = 50
ES = EF Task 7 = 50
Duration = 5
EF = 50 + 5 = 55
“Test Software”

When "Develop Data Analysis Software" and "Develop Software Test Data" are finished, “Test Software” can start.
The later of the two EF times for “Develop Data Analysis Software" and "Develop Software Test Data" is 50.
"Test Software" has an estimated duration of 5 days, so its ES is day 50 and its EF is day 55.
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“Input Response Data”

Latest of Tasks 9 and 10 = 113
ES = EF Task 9 = 113
Duration = 7
EF = 113 + 7 = 120
“Input Response Data”

When “Mail Questionnaire & Get Responses” and "Test Software" are finished, “Input Response Data” can start.
The later of the two EF times for “Mail Questionnaire & Get Responses” and "Test Software" is 113.
"Input Response Data" has an estimated duration of 7 days, so its ES is day 113 and its EF is day 120.
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“Analyze Results”

ES = EF Task 11 = 120
Duration = 8
EF = 120 + 8 = 128
“Analyze Results”

When “Input Response Data” is finished on day 120, “Analyze Results” can start.
It has an estimated duration of 8 days, so its ES is day 120 and its EF is day 128.
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“Prepare Report”

ES = EF Task 12 = 128
Duration = 10
EF = 128 + 10 = 138
Project not complete in required time
“Prepare Report”

When “Analyze Results” is finished on day 128, “Prepare Report” can start.
It has an estimated duration of 10 days, so its ES is day 128 and its EF is day 138.
The required completion time for this entire project is 130 days. 138 days is 8 days beyond the required completion time, therefore the project was not completed in the required time.
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Schedule Table ES and EF

Schedule Table ES and EF

This figure depicts the ES and EF times for the consumer market study project we just analyzed, in a schedule table format.

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Latest Start and Finish Times

Latest start time (LS)

Latest time by which a specific activity must be started

Latest finish time (LF)

Latest time by which a specific activity must be completed

LS = LF – Estimated Duration

Calculate backward through the network diagram

Latest Start and Finish Times

Latest start time (LS) is the latest time by which a specific activity must be started in order for the entire project to be finished by its required completion time.

It is calculated by subtracting the activity’s estimated duration from the activity’s latest finish time.
Latest finish time (LF) is the latest time by which a specific activity must be completed in order for the entire project to be finished by its required completion time.

It is calculated on the basis of the project required completion time and the estimated durations of succeeding activities.
LS = LF– Estimated Duration

Calculate backward through the network diagram from the end of the project to the beginning of the project.
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Rule 2:

The latest finish time for a specific activity must be the same as or earlier than the earliest of all the latest start times of all the activities emerging directly from that specific activity.

Rule 2:

The latest finish time for a specific activity must be the same as or earlier than the earliest of all the latest start times of all the activities emerging directly from that specific activity.

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Latest Start and Finish Times Calculation

Why is the LF for “Print Posters & Brochures” 20?

Latest Start and Finish Times Calculation

These figures show two activities that emerge directly from an activity labeled, “Print Posters & Brochures.”

This project is required to be completed by day 30. Therefore, “Distribute Posters” must be started by day 20 because it has an estimated duration of 10 days, and “Mail Brochures” must be started by day 25 because it has an estimated duration of 5 days.
The earlier of these two LSs is day 20. Therefore, the latest that “Print Posters & Brochures” can finish is day 20, so that “Distribute Posters” can start by day 20.
Even though “Mail Brochures” does not have to start until day 25, “Print Posters & Brochures” must finish by day 20, or else the entire project will be delayed.
If “Print Posters & Brochures” does not finish until day 25, then “Distribute Brochures” will not be able to start until day 25.
Because “Distribute Brochures” has an estimated duration of 10 days, it will not finish until day 35, which is 5 days beyond the project required completion time.
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© 2018 Cengage®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part, except for use as permitted in a license distributed with a certain product or service or otherwise on a password-protected website or school-approved learning management system for classroom use.

“Prepare Report”

Required completion = 130
LF = Complete date = 130
Duration = 10
LS = 130 - 10 = 120
“Prepare Report”

Now let us look at how to set up the backward calculations for the consumer market study project we just analyzed.

The required completion time for the project is 130 working days.
Therefore, the latest that “Prepare Report,” the last activity, can finish is day 130, and the latest that it can start is day 120 because its estimated duration is 10 days.
In order for “Prepare Report” to start on day 120, the latest that “Analyze Results” can finish is day 120. If the LF for “Analyze Results” is day 120, then its LS is day 112 because its estimated duration is 8 days.
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© 2018 Cengage®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part, except for use as permitted in a license distributed with a certain product or service or otherwise on a password-protected website or school-approved learning management system for classroom use.

“Analyze Results”

LF = LS Task 13 = 120
Duration = 8
LS = 120 - 8 = 112
“Analyze Results”

In order for “Prepare Report” to start on day 120, the latest that “Analyze Results” can finish is day 120.
If the LF for “Analyze Results” is day 120, then its LS is day 112 because its estimated duration is 8 days.
In order for “Analyze Results” to start on day 112, the latest that “Input Response Data” can finish is day 112.
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© 2018 Cengage®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part, except for use as permitted in a license distributed with a certain product or service or otherwise on a password-protected website or school-approved learning management system for classroom use.

“Input Response Data”

LF = LS Task 12 = 112
Duration = 7
LS = 112 - 7 = 105
“Input Response Data”

If the LF for “Input Response Data” is day 112, then its LS is day 105 because its estimated duration is 7 days.
In order for “Analyze Results” to start on day 112, the latest that “Input Response Data” can finish is day 112.
If the LF for “Input Response Data” is day 112, then its LS is day 105 because its estimated duration is 7 days.
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© 2018 Cengage®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part, except for use as permitted in a license distributed with a certain product or service or otherwise on a password-protected website or school-approved learning management system for classroom use.

“Test Software” and “Mail Questionnaire & Get Responses”

LF = LS Task 11 = 105
Task 9
Duration = 65
LS = 105 - 65 = 40
Task 10
Duration = 5
LS = 105 - 5 = 100
“Test Software” and “Mail Questionnaire & Get Responses”

In order for “Input Response Data” to start on day 105, the latest that “Mail Questionnaire & Get Responses” and "Test Software" can finish is day 105.
If the LF for “Mail Questionnaire & Get Responses” is day 105, then its LS is day 40 because its estimated duration is 65 days. If the LF for "Test Software"” is day 105, then its LS is day 100 because its estimated duration is 5 days.
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© 2018 Cengage®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part, except for use as permitted in a license distributed with a certain product or service or otherwise on a password-protected website or school-approved learning management system for classroom use.

"Develop Data Analysis Software" and "Develop Software Test Data"

LF = LS Task 10 = 100
Task 7
Duration = 12
LS = 100 - 12 = 88
Task 8
Duration = 2
LS = 100 - 2 = 98
"Develop Data Analysis Software" and "Develop Software Test Data"

In order for “Test Software” to start on day 100, the latest that "Develop Data Analysis Software" and "Develop Software Test Data" can finish is day 100.
If the LF for “Develop Data Analysis Software” is day 100, then its LS is day 88 because its estimated duration is 12 days.
If the LF for “Develop Software Test Data” is day 100, then its LS is day 98 because its estimated duration is 2 days.
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© 2018 Cengage®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part, except for use as permitted in a license distributed with a certain product or service or otherwise on a password-protected website or school-approved learning management system for classroom use.

“Prepare Mailing Labels” and "Print Questionnaire”

LF = LS Task 9 = 40
Task 5
Duration = 2
LS = 40 - 2 = 38
Task 6
Duration = 10
LS = 40 - 10 = 30
“Prepare Mailing Labels” and "Print Questionnaire”

In order for “Mail Questionnaire & Get Responses” to start on day 40, the latest that “Prepare Mailing Labels” and "Print Questionnaire" can finish is day 40.
If the LF for “Prepare Mailing Labels” is day 40, then its LS is day 38 because its estimated duration is 2 days.
If the LF for “Print Questionnaire” is day 40, then its LS is day 30 because its estimated duration is 10 days.
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© 2018 Cengage®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part, except for use as permitted in a license distributed with a certain product or service or otherwise on a password-protected website or school-approved learning management system for classroom use.

“Review Comments & Finalize Questionnaire”

LF = Earliest LS of Tasks 5, 6, 7, and 8 = 30
LF = LS Task 6 = 30
Duration = 5
LS = 30 - 5 = 25
“Review Comments & Finalize Questionnaire”

Look at “Review Comments & Finalize Questionnaire.”
In order for the four activities emerging from this activity to start by their LS times (so that the project can finish by its required completion time of 130 days), “Review Comments & Finalize Questionnaire” must be finished by the earliest LS of all four activities, according to Rule 2.
The earliest of the four LSs is day 30, the latest time by which “Print Questionnaire” must start.
Therefore, the latest that “Review Comments & Finalize Questionnaire” can finish is day 30.
If the LF for “Review Comments & Finalize Questionnaire” is day 30, then its LS is day 25 because its estimated duration is 5 days.
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© 2018 Cengage®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part, except for use as permitted in a license distributed with a certain product or service or otherwise on a password-protected website or school-approved learning management system for classroom use.

“Pilot-Test Questionnaire”

LF = LS Task 4 = 25
Duration = 20
LS = 25 - 20 = 5
“Pilot-Test Questionnaire”

In order for “Review Comments & Finalize Questionnaire” to start on day 25, the latest that “Pilot-Test Questionnaire” can finish is day 25.
If the LF for “Pilot-Test Questionnaire” is day 25, then its LS is day 5 because its estimated duration is 20 days.
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© 2018 Cengage®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part, except for use as permitted in a license distributed with a certain product or service or otherwise on a password-protected website or school-approved learning management system for classroom use.

“Develop Draft Questionnaire”

LF = LS Task 3 = 5
Duration = 10
LS = 5 - 10 = -5
“Develop Draft Questionnaire”

In order for “Pilot-Test Questionnaire” to start on day 5, the latest that “Develop Draft Questionnaire” can finish is day 5.
If the LF for “Develop Draft Questionnaire” is day 5, then its LS is day -5 because its estimated duration is10 days.
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© 2018 Cengage®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part, except for use as permitted in a license distributed with a certain product or service or otherwise on a password-protected website or school-approved learning management system for classroom use.

“Identify Target Consumers”

LF = LS Task 2 = -5
Duration = 3
LS = -5 - 3 = -8
Start date = 0
Project is 8 days late at start
“Identify Target Consumers”

In order for “Develop Draft Questionnaire” to start on day -5, the latest that “Identify Target Consumers” can finish is day -5.
If the LF for “Input Response Data” is day -5, then its LS is day -8 because its estimated duration is 3 days.
Therefore, the consumer market study project must start 8 days earlier than the planned start date in order to finish in the required 130 days.
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© 2018 Cengage®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part, except for use as permitted in a license distributed with a certain product or service or otherwise on a password-protected website or school-approved learning management system for classroom use.

Schedule Table LS and LF

Schedule Table LS and LF

Here you see a figure that depicts the schedule table with the LS and LF values added.

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© 2018 Cengage®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part, except for use as permitted in a license distributed with a certain product or service or otherwise on a password-protected website or school-approved learning management system for classroom use.

Total Slack

Sometimes called float

The difference between EF time of last activity and the project required completion time

Negative slack

Lack of slack over the entire project

Amount of time an activity must be accelerated

Positive slack

Maximum amount of time that the activities on a particular path can be delayed without jeopardizing on-time completion

Total Slack

Total slack is sometimes called float.
It is the difference between EF time of last activity and the project required completion time.
Total slack is calculated for each of the activities by finding the difference between the EF time of the activity and the LF of the activity.
You also look at the difference between the ES and LS of the activity.
Negative slack indicates:
A lack of slack over the entire project
The amount of time an activity must be accelerated to complete the project by the required completion time
Positive slack indicates the maximum amount of time that the activities on a particular path can be delayed without jeopardizing completion of the project by the required completion time.
If the total slack is zero, the activities on the path do not need to be accelerated, but cannot be delayed.
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© 2018 Cengage®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part, except for use as permitted in a license distributed with a certain product or service or otherwise on a password-protected website or school-approved learning management system for classroom use.

How much slack is in this project to put up new wallpaper?

Student Discussion

How much slack is in this project to put up new wallpaper?

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© 2018 Cengage®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part, except for use as permitted in a license distributed with a certain product or service or otherwise on a password-protected website or school-approved learning management system for classroom use.

Possible responses to Student Discussion

The total completion time is 20 days

The tasks take 15 days (7+5+3)

The project has 5 days of slack

How much slack is in this project to put up new wallpaper?

This figure depicts a project to remove old wallpaper and put up new wallpaper.

The total completion time is 20 days. The tasks take 15 days (7+5+3).

Therefore, the project has 5 days of slack.

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© 2018 Cengage®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part, except for use as permitted in a license distributed with a certain product or service or otherwise on a password-protected website or school-approved learning management system for classroom use.

Critical Path

Longest path in the overall network diagram
Find which activities have the least amount of slack
Critical Path

The critical path is this longest path in the overall network diagram.
One way to determine which activities make up the critical path is to find which ones have the least amount of slack.
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© 2018 Cengage®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part, except for use as permitted in a license distributed with a certain product or service or otherwise on a password-protected website or school-approved learning management system for classroom use.

Critical Path Through a Project

Critical Path Through a Project

This table shows slack values for each activity in the consumer market study project we just analyzed.
Those with -8 as the total slack are the activities on the critical path.
The figure on the bottom of the slide depicts the critical path through the network diagram for the consumer market study project.
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© 2018 Cengage®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part, except for use as permitted in a license distributed with a certain product or service or otherwise on a password-protected website or school-approved learning management system for classroom use.

Change in Slack for Critical Path

Change in Slack for Critical Path

This figure depicts the change in the critical path if the estimated duration of the Mail Questionnaire & Get Responses task is reduced from 65 days to 55 days.

Note that the tasks on the critical path now have a total slack of 2, the least amount slack in the project.
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© 2018 Cengage®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part, except for use as permitted in a license distributed with a certain product or service or otherwise on a password-protected website or school-approved learning management system for classroom use.

Free Slack

Time a specific activity can be postponed without delaying the ES of its immediate successor activities

Calculation

Find lowest of the values of total slack for all the activities entering into a specific activity

Subtract value from the values of total slack for the other activities also entering into that same activity

Free Slack

Free slack is the amount of time a specific activity can be postponed without delaying the earliest start time of its immediately succeeding activities.

Free slack is calculated by:

Finding the lowest of the values of total slack for all the activities entering into a specific activity
Then subtracting that value from the values of total slack for the other activities also entering into that same activity
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© 2018 Cengage®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part, except for use as permitted in a license distributed with a certain product or service or otherwise on a password-protected website or school-approved learning management system for classroom use.

Total Slack Compared to Free Slack

Total slack for Activity 7 = 50

Total slack for Activity 8 = 60

Free slack for Activity 8 = 60 – 50 = 10 days

Total Slack compared to Free Slack

Let’s look at an example of free slack.

Activities 7 and 8 are predecessors for Activity 10 in the figure above.
The values of total slack for activities 7 and 8 are 50 and 60 days, respectively.
The lesser of these two values is 50 days.
Therefore, activity 8, “Develop Software Test Data,” has a free slack of 10 days (60 – 50 = 10) and can slip by up to that amount without delaying the earliest start time of activity 10, “Test Software.”
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© 2018 Cengage®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part, except for use as permitted in a license distributed with a certain product or service or otherwise on a password-protected website or school-approved learning management system for classroom use.

Bar Chart Format

Gantt chart tool for planning and scheduling
Activities on side
Time scale on top or bottom
Estimated duration in bars
Automatically generated in software systems
Can show relationships between activities
Bar Chart Format

A Gantt chart is the name commonly used for the type of bar chart tool employed in planning and scheduling.
As you can see in the Gantt chart on this slide, the activities are listed on the left-hand side and there is a time scale along the bottom or the top.
The estimated duration for each activity is indicated by a bar spanning the period during which the activity is expected to be accomplished.
Gantt charts often also have a column that indicates who is responsible for each task.
This Gantt chart depicts the consumer market study project that we have been analyzing.
You can probably see how this is an easy way to visually represent when activities are scheduled to occur during a project.
A Gantt chart is a traditional bar chart in that it does not graphically display the dependent relationships of activities.
Be sure to create the network diagram and connect the bars in the Gantt chart with arrows to show relationships.
Project management software can automatically generate a time-scaled bar chart from the schedule table that is based on the network diagram.
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© 2018 Cengage®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part, except for use as permitted in a license distributed with a certain product or service or otherwise on a password-protected website or school-approved learning management system for classroom use.

Project Control Process

Meetings occur regularly
Gather data on actual performance
Record changes
Monitor progress
Project Control Process

Here you see a figure that illustrates the steps in the project control process.

The project control process starts with establishing a baseline plan that shows how the project scope will be accomplished on schedule and within budget.
Once this baseline plan is agreed upon by the customer and the contractor or project team, the project work can be performed.
It is necessary to monitor the progress to ensure that everything is going according to the plan.
The project control process involves regularly gathering data on project performance, comparing actual performance to planned performance, and taking corrective action immediately if actual performance lags behind planned performance.
This process must occur regularly throughout the project.
Establish regular reporting meetings to compare actual to planned progress.
Gather data on actual performance.
Record information on changes to the project scope, schedule, and budget.
The key to effective project control is measuring actual progress and comparing it to planned progress on a timely and regular basis and taking any needed corrective action immediately.
Project management is a proactive approach to controlling a project to ensure that the project objective is accomplished, even when things do not go according to plan.