0" or "Pre-phase A" of the ESA Project Phases in which needs are identified and Mission Analysis is performed.

Phase 0 focusses the following:

*Identification and characterisation of the intended mission.
*Expression in terms of needs, expected performance and dependability and safety goals.space
*Assessment of operating constraints, in particular as regards the physical and operational environment.
*Identification of possible system concepts, with emphasis on the degree of innovation and any critical aspect.

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