MIL-STD-46855A
5. DETAILED REQUIREMENTS
Building upon the three major interrelated areas of system development outlined in 4.1 (analysis, design and development, and test and evaluation), this section provides greater detail regarding the various tasks and activities to be conducted as part of the human engineering program.
5.1 Human engineering in analysis. This section specifies the various analyses to be conducted to analyze the mission and its implied requirements, ensure the proper allocation of system functions, and ensure that the tasks assigned to the human (operator, maintainer, or support personnel) are within human capabilities and limitations. These analyses shall be conducted as early as possible and may be updated at any point in the acquisition lifecycle.
5.1.1 Analyze human and system performance requirements. Determine human and system performance requirements for system operation, maintenance, and support functions based on an analysis of the functions that must be performed by the system in achieving its objective(s) within specified operational environments, identification of the system requirements that depend on human and system performance, and human engineering principles.
5.1.1.1 Conduct an information flow and processing analysis. Analyses shall be performed to determine the necessary information flow and processing to accomplish the system objectives. These analyses shall include decisions and operations without assuming any specific hardware or software implementation or predetermined level of human involvement.
5.1.1.2 Describe operator and maintainer capabilities. Plausible human roles in the system (e.g., operator, maintainer, programmer, decision maker, communicator, monitor) shall be identified and defined. The capabilities and associated quantities of the operators and maintainers shall be coordinated with the manpower, personnel, and training communities to ensure that they will be available in the time frame that the system is to be fielded. Estimates of capabilities in terms of productivity, workload, accuracy, rate, and time delay shall be prepared for each operator or maintainer information function. Comparable estimates of equipment capabilities shall also be made. These estimates shall be used initially in determining the allocation of functions and shall later be refined for use in defining operator and maintainer information requirements and control, display, and communication requirements. In addition, estimates shall be made of how implementing or not implementing human engineering design recommendations is likely to affect these capabilities. Results from studies in accordance with 5.2.2 may be used as supportive inputs for these estimates.
5.1.1.3 Determine the allocation of functions. Analysis and trade-off studies shall be conducted using known constraints and projected operator and maintainer performance and cost data to determine which system functions shall be hardware-implemented, software-controlled, or performed by the human operator or maintainer. Function allocation and automation decisions that are inherent to a previously deployed system, subsystem, or equipment selected for the
system being acquired shall be analyzed to ensure that they are consistent with function allocation decisions for the rest of the system, and with operator and maintainer capabilities and limitations. Allocation of functions shall consider the mission performance risks of incorrectly allocating a
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