Input from any different department (e.g. Marketing, Regulatory, Engineering) can only help in improving the efficiency of the device. There many be someone who doesn’t offer a feasible specification but it can always be rejected. Asking for input from any individual from any other department will allow the project team to address concerns and possible questions that may arise later because they are given different perspectives. The most efficient way to bring all inputs together would be to have a document in which people can access to so that they can write and describe their thoughts on what they think is a good input. People who are working on different projects or any history on previous project could serve as a source for new inputs into a DID. Anyone can offer good thoughts and ideas, which is why it’s recommended that many different people should be allowed to put their ideas into the DID. Customers, the sponsor, other project managers, and certain departments like Regulatory, Clinical Research, Quality and Engineering should definitely be allowed to input their specifications into the DID.