During design, the HE engineer has two roles. In one role, the HE engineer represents the potential user, operator, and maintainer and is concerned with ease of operation, safety, comfort, work loads, and so forth. In the other role, the HE engineer evaluates people as "components" and their contribution to product effectiveness. The HE engineer is concerned with many design issues including:
- Safety of operators and maintainers
- Which functions to allocate to humans
- How best to present information to the user, operator, or maintainer
- The design of tools
- The design of controls
- Required skill levels
Military standard 1472, MIL-HDBK-759, and MIL-HDBK-338 provide detailed information and data on HE. In addition, Appendix C includes design guidance related to HE.