Advantages of the DID document would be to have a general understanding of what the product is going to look like. This is basically a mental picture of what you and the department will believe the design is going to be. With a DSD, this will be more specifically what the idea will become. With design specifications, you can decide what kind of red you want the knob to be and what size is best for the product. The disadvantages of a DID would be that it’s not specific enough so when one person thinks of the general idea, it could mean something else is someone else’s eyes. The disadvantages of a DSD would be that with specific descriptions, it can become more difficult to make the product. I believe they go hand in hand, where you have a general idea and you make it happen with specific features. Both these documents will provide different needs for the product and are both beneficial at different stages of the product.