DID and DSD are both important documents because they provide the customer intended design and the design feature specification. The DID document gives an insight to what the customer wants, the document shows what the product will look like. It will not show what the dimensions of the feature used in creating the design, this where DSD help. DSD document shows the schematics, which helps the manufacture group in creating the design. Without these document the customer will not know if design discrpition is met, the customer must see if it is the end product they want, and must have the dimension in order to be created.