The advantages of having each document is that it gives the team time to plan out their design study and to get a general idea of what they need their product to be. With the DID the team is able to first submit a document in the earlier stages of the process where it gives them a general idea of what items and specs they need for their model. The DID also helps set up the later stages when you need to create the DSD. A disadvantage is that although it helps with the general needs of the client, it does not list anything specific that needs to be done, which will require more work and meetings later on to confirm what is needed, and it can give too broad of a description to the device where some specs will need more elaborating. The advantage of the DSD is that it maps out exactly what is needed from the product, providing clear details and instructions for the design team and manufacturing team to work off of. The disadvantage is that when testing for the verification and validation process, the specs may be too specific and can hinder your design process. The disadvantage with the DSD is that it requires more time to make it perfect, so that you will not have to take more time making change request to the document later on. It may also be the reason why your design is failing and will not pass because of how specific the details were and because of not anticipating these details interfering.