MIL-STD-46855A
as part of the larger system engineering and HSI effort. This human engineering effort shall convert the requirements, system, and task analysis data into a detailed design so as to create a human-system interface that will operate within human performance capabilities, meet system functional requirements, and accomplish system objectives. The human engineering design of a system shall also take into account any requirements to interoperate with other systems and personnel. The human engineering program shall be executed by a qualified human engineering practitioner(s), working as an integrated member of the system engineering team. As appropriate, the responsible human engineering practitioner should have sign off authority for
those portions of the program's design and development that have a human interface. Experience
has shown that an isolated or "standalone" human engineering program that is not integrated with the larger system engineering efforts and with activities in other HSI domains cannot be effective. Therefore, only an integrated human engineering program shall be permitted.
4.1.3 Test and evaluation. Human engineering test and evaluation shall be conducted to support design decisions, verify, and validate that military systems, equipment, and facilities meet human engineering criteria, can be operated and maintained in their intended operational environment, within the intended users' performance capabilities, and are compatible with the overall system requirements.
4.2 Early application of human engineering in system acquisition. Human engineering activities are required throughout the system acquisition process, occurring at each point where the user (operators, maintainers, and support personnel) interacts with the system. Department of Defense acquisition policy emphasizes the importance of optimizing total system performance and minimizing the cost of ownership. The total system includes not just the hardware and software and associated user interfaces, but also the personnel who operate, maintain, and
support the system; the training and training devices; job aids; and the operational and support infrastructure. Human engineering assists in fully integrating the human into the total system. Human-system performance impacts associated with proposed designs shall be identified in order to reduce technical risks and lifecycle costs (e.g., research, engineering, design, and operations over the economic life of the system). Since operational costs are often greater than
acquisition costs, lifecycle costs shall be assessed early in the program. Early program decisions shall consider operator and maintainer capabilities and limitations to avoid expensive training, staffing, or redesigns. The human engineering practitioner shall identify and assess opportunities to reduce lifecycle costs through acquisition or design changes, and shall identify acquisition and design changes that are likely to adversely impact lifecycle costs.
4.3 Human engineering program planning. Human engineering activities shall be described
in a document such as a Human Engineering Program Plan (HEPP) (see 6.3). The document shall be prepared in accordance with the requirements of this standard, the system specification and the statement of work, and shall include the tasks to be performed, human engineering milestones,
level of effort, methods to be used, design concepts to be used, and the test and evaluation
program. The human engineering effort shall be part of an integrated effort within the total project, and shall include a description of human engineering participation in system (hardware, software, and associated user interfaces) design and collaboration with other program disciplines, including but not limited to, all domains of Human Systems Integration.
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