The primary output of the design phase is a design document. The design document is to give all internal constituents (developers and management) a clear picture of how the features described in the specifications. Implementation is to use the design document to produce code. It is a core process workflow in the software-engineering process, whose purpose is to implement and unit test of the code. During this phase, the actual work of the project is undertaken to produce the project's deliverables according to the chosen solution and make it ready for testing team.