It is imperative for the specifications in the design input document during the planning phase to be accurate and clear. In order to accomplish this, there should be collaboration from many different people in order to cover all bases on this document. The customer needs need to be taken in mind in order for the engineers to plan out the details. All in all, the design input document needs to be very broad and also very specific in order to cover the entirety of the project and allow for an easy transition through the design phase.