The DID document is a very rough sketch. When anyone looks at it, they should be able to tell what it is even though there aren’t many details. This sort of document is great for customers who don’t really understand the specifics of everything that can goes on. The DSD is the Mona Lisa of the document. You add in all the details and those that can read and understand what is going on should be able to picture exactly what it will look like and should be able to recreate it themselves and have it be an exact copy of the product. This is meant more for the team that is producing the product so they know exactly what it is the customer wants for the product and are able to meet the customers needs and make any necessary changes much more easily.