Systems Engineering Glossary

Need Statement.  The need statement is a concise statement of need describing the goals or objectives of the system development.

Non-Developmental Item (NDI).  A non-developmental item incudes any item that does not require development as part of the Acquisition Phase for this system development because it already exists, as a commercial off-the-shelf product, or as a product developed for another system.

Non-Functional Requirement.  While a functional requirement defines the services and functions that the system should provide, a non-functional requirement describes the qualities or attributes that it must posses.

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