MIL-STD-46855A
APPENDIX A
A.4.3 Contractual applicability.
A.4.3.1 Evolutionary development. MIL-STD-46855 shall be applied across the full lifecycle of an evolutionary development effort. At each evolutionary phase or contract, the application of MIL-STD-46855 and associated human engineering design criteria, and any tailoring previously made, shall be updated as required. For evolutionary development of older
or existing systems, equipment, software and associated user interfaces, and facilities, this standard will generally apply only to new designs and procedures involving human interfaces and old designs, procedures, and interfaces which may be impacted thereby. Old systems undergoing improvement through evolutionary means will generally not have the standard applied to components retained and unaffected by such evolutionary development techniques. Old systems undergoing improvement should have this standard applied if there is any change in how the equipment is used. It is important to understand that there may be exceptions to this general rule; therefore, evaluation by the human engineering practitioner is extremely advisable.
A.4.3.2 Product improvement. Recognizing that product improvement actions may occur during more than one acquisition phase and that product improvements can involve concept exploration and definition, demonstration and validation, engineering and manufacturing development tasks or a combination of these, the procuring activity should tailor the human engineering program to the specific performance objectives of the product improvement program.
A.4.3.3 Production and deployment or operations and support phases. Design changes affecting human performance during the production and deployment or operations and support phases can, like product improvement actions, involve conceptual concept exploration and definition, demonstration and validation, or engineering development human engineering tasks; therefore, the procuring activity should tailor the human engineering program to the specific performance objectives of the design changes. Particular attention should be directed toward failure analysis, quality assurance, drawing review, and software and associated user interface considerations.
A.4.3.4 Nondevelopmental item (NDI). Where an NDI is being acquired, applicable provisions of MIL-STD-46855 may be used to guide government in-house efforts (see 6.1). Paragraph 5.1 should be considered to ensure the availability of adequate information on operator and maintainer capabilities or to conduct a task analysis to provide documentation and context for how the item will be used. Paragraph 5.2 should be considered to ensure that MIL-STD-1472 will be a part of the selection criteria for determining the suitability of the item. Paragraph 5.3 should be considered, as applicable, to verify human performance supports total system performance. In addition, the nature of the NDI program will influence tailored, in-house use of this standard. Where an item requires minor modification to meet the requirements of the procuring activity, and where the modification is driven by human performance or will result in significant human performance effects, applicable analysis tasks of 5.1, 5.2, and their subparagraphs may be used for identifying and implementing the modification.
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