Systems Engineering Glossary

Data Item Description (DID).  A Data Item Description (DID) is a document that is used to define the format, content and constraints to which a contract deliverable must comply.

Deliverable.  A deliverable is an item that has been agreed is to be delivered to the acquirer by the supplier (contractor).

Derived Requirement.  A derived requirement is one that was not explicitly stated by a stakeholder but has been derived as part of the requirements analysis process.

Design Constraint.  A design constraint refers to some limitation on the conditions under which a system is developed, or on the requirements of the system.

Detailed Design and Development.  Detailed Design and Development follows Preliminary Design and is responsible for the detailed design and development of individual products or components of the system.

Developer.  The developer is responsible for development, which refers to those activities undertaken to evolve the system from the statement of need by the user to the acceptance into service by the user.

Development Specification.  The Development Specification is produced by the Preliminary Design activities in the systems engineering lifecycle.

Developmental Test And Evaluation (DT&E).  Developmental Test and Evaluation (DT&E) is largely undertaken in the Acquisition Phase to support the design and development effort.

Deviation.  A deviation is a formal written authorisation issued to allow a configuration item to depart from approved configuration management documentation.

Disposal.  Disposal is the final act of the system lifecycle. Once a system has reached the end of its life through obsolescence or economic viability, it must be disposed of.

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