Design inputs acts as a foundation for the medical devices so this becomes necessary for any device to get into market. I agree that getting inputs right is the most important thing for developing an device. Desihgn inputs comprises of requirements, criterias for performances, features and needs of the product. Few goals to consider are 1) capture all performance, safety and regulatory requirements. 2) Look for user needs. 3) Make things clear and objective. 4) State them in a way that allows to approve or disapprove them. It should include acceptance criteria.