E3.3.2. Document Mission Need. Documenting mission need is the process activity that initializes the DITSCAP. Initialization occurs when an information system is developed or modified in response to an identified operational requirement or mission need. The mission need, figure E3-3, is either a document or compilation of information stating the requirements of the system and describing its intended capabilities. Those capabilities include functions the system should perform, desired interfaces and capabilities associated with those interfaces, the information to be processed, the operational organizations supported, the intended operational environment, and the operational threat. Typically, the mission need is described in a high-level requirements document before the DITSCAP is initiated.