Design specification

A design specification (or product design specification) is a document which details exactly what criteria a product or a process should comply with. If the product or its design are being created on behalf of a customer, the specification should reflect the requirements of the customer or client. A design specification could, for example, include required dimensions, environmental factors, ergonomic factors, aesthetic factors, maintenance requirement, etc. It may also give specific examples of how the design should be executed, helping others work properly (a guideline for what the person should do).