The purposes of Analysis & Design are:

• To transform the requirements into a design of the system-to-be.
• To evolve a robust architecture for the system.
• To adapt the design to match the implementation environment, designing it for performance.

The Analysis & Design discipline is related to other disciplines, as follows:

• The Requirements discipline provides the primary input for Analysis and Design.
• The Implementation discipline implements the design.
• The Test discipline tests system designed during Analysis and Design.
• The Environment discipline develops and maintains the supporting artifacts that are used during Analysis and Design.
• The Project Management discipline plans the project, and each iteration (described in an Iteration Plan).