MIL-STD-1798C
5. DETAILED REQUIREMENTS
5.1 (Task I) Preliminary Planning.
Task I is intended to be started in advance of Milestone B.The purpose of Task I is to scope the tailoring, planning, and development strategy for applying the MECSIP. The tasks expected during this period for major weapon system procurements include the methods detailed in the subparagraphs which follow. Appendix A provides guidance specific to mechanical subsystems development milestones and technical reviews.
5.1.1 Program strategy.
A MECSIP strategy shall be developed early in the acquisition process to establish definitive objectives and definitive measures demonstrating objectives are achieved. The MECSIP strategy will support and be one of the elements of the overall acquisition strategy for the system. Areas such as materials, processes, manufacturing, testing, facilities, manpower, funds, interface, and schedules are all involved in the development of this strategy. Technology improvements and advancements necessary to achieve specific Program objectives must be defined, quantified, scheduled, and evaluated for cost benefits. The strategy will become progressively definitive as the acquisition strategy matures, and as it becomes possible to develop and weigh alternative approaches to satisfy system needs. Simply stated, the strategy should address the "what", "how", "when", and "with what" aspects of applying the MECSIP to full acquisition and deployment of the systems and equipment.
5.1.2 Trade studies.
As part of the early acquisition process, system engineering trade studies shall be conducted at both the system- and component-level, as appropriate. The purpose of these trade studies is to examine alternative approaches which satisfy the system operational safety, suitability, and effectiveness. Proper consideration must be given to supportability, reliability, maintainability, and cost, in addition to technical performance, when these trade studies are performed. The use of new computer programs and technologies for component tracking and monitoring should be included in the trade studies.
5.1.3 Requirements development.
Part of the early acquisition process shall be devoted to the study and refinement of system- level requirements as they evolve from the consideration of operational needs, supportability goals, etc. As part of this refinement process, system requirements shall be evaluated, particularly in conjunction with the early trade studies. The objective is to enter into system development with optimized and balanced design requirements.
A key aspect of requirements development is to recognize that aircraft being developed with a given set of operational requirements today will remain in service for decades and will see those operational missions and the installed equipment to execute those missions evolve over time. Because modern aircraft tend to have highly integrated systems, future redesign to provide growth capacity tends to be technically challenging and expensive. The investment necessary
to build in provisions for growth capacity, where needed, early in the design will pay huge dividends during the operational life of the weapon system.
Each subsystem covered by MECSIP shall be analyzed to determine if growth capacity of that system should be a derived requirement and if so, what level of growth capacity is required. Where growth capacity is required, the requirement shall be included in the System Performance Specification. The Program shall define a curve showing the predicted
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