In terms of human system design and modeling, discuss the three sub-stages of the second stage of advanced development.

        In terms of human system design and modeling the second stage is known as advanced development. The second stage is further sub-divided into three stages. Allocation of requirements, Trade off and Optimization and Detailed design specifications.

Allocation of Requirements: Sub-systems and component units are provided with several factors which help the HF engineer to develop performance of sub-systems and component units by fulfilling all the requirements.

Trade off and Optimization: HF designer has to discover the optimal configuration by the help of analytical methods such as mathematical techniques in human operator and technological model. Model is important as it aids in risk free experimentation. Complicated events such as neuromuscular events which are not easy to observe are studied. It allows understanding of tests, sensitivity tests and non-destructive testing which can replace ethically sensitive human experimentation.

Detailed Design Specifications: It allows HF designer to explained detailed specifications and provides the information about necessary design detail and its development.