Project phases

Project phases are used for organizing the life cycle of a spacecraft.

While dealing with real world engineering, this article can also be useful for add-on developers.

Phase	ESA terms ECSS-M-30A	Trivial terms
0	Mission Analysis	Advanced Studies
A	Feasibility	Concept
B	Preliminary Definition	Definition
C	Detailed Definition	Development
D	Production	Production
E	Utilization	Operations
F	Disposal

It is possible to combine phases, for example C+D->C/D or 0+A+B+C -> R&D

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