The Inception Phase is a discovery phase. The problem to be solved is verbalized and discussed among the team and with customers. Assumptions are expressed and may be verified or rejected using proof of concept prototyping techniques. The output of this phase is the identification of the external interfaces, an initial risk assessment, and a set of system requirements. Customers, clients, users, and other interested parties bring various ideas and points of view to this phase and offer the possibility of an early and enthusiastic buy-in.