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They are expected to actively mitigate uncertainty in requirements through prototyping and experimentation activities.Requirements are derived from operational needs and concepts and are used as inputs to design and development.They are expected to be able to decompose operational needs and requirements and flow them down to operational capabilities, technical requirements, technical implementation, and verification of the requirements.MITRE SEs are expected to ensure operational value and traceability from the operational need all the way to the system verification and ultimately to the fielding and sustainment of the system.The article Special Considerations for Conditions of Uncertainty: Prototyping and Experimentation discusses when and how these tools should be applied, the different approaches, "weight" or fidelity available (and which level makes sense for what situations), and ideas for how to evolve the prototyping and experimentation efforts over time to reduce the risk of requirements uncertainty. International Council on Systems Engineering (INCOSE) website, accessed July 22, 2014. This often involves acceptance of fitness for purpose with end users and other product stakeholders. It is sometimes said that validation can be expressed by the query "Are you building the right thing?
Requirements engineering starts early in concept development by eliciting and collecting operational needs from the relevant user community and developing requirements from the needs.A requirement is a singular documented need—what a particular product or service should be or how it should perform.It is a statement that identifies a necessary attribute, capability, characteristic, or quality of a system in order for it to have value and utility to a user.The article Analyzing and Defining Requirements describes attributes of a well-crafted requirement to minimize design missteps, confusion, and rework downstream.It also references tools that exist within MITRE to support and manage this phase of the requirements engineering effort.
Requirements are also an important input to verification because tests must trace back to specific requirements to determine if the system performs as intended.