Advantages of DID is that serves as an overall/general description of the product it also states the design input as clear and objective without numerical specifications. The major disadvantage with DID is that it’s too broad. Meanwhile, DSD captures numerical specifications that will serve as the foundation for the user requirement document. A disadvantage of DSD is that it can take a while to develop because it must ensure that specifications are appropriate and that they address the intended use of the device or product. However, both of them are important because they state all functional, performance, safety, and regulatory requirements.