June 15, 2016

Project development

1. Phases and reviews


From the design stage through to removal from service, the life of a project evolves through phases.

Each of these phases correlates to the product's transition from one reference condition to another.

In all, the project can generally be broken down into seven main phases:

  • phase 0 : need identification / mission analysis
  • phase A : feasibility
  • phase B : preliminary definition
  • phase C : detailed definition
  • phase D : production / ground qualification
  • phase E : use / operations
  • phase F : removal from service


The implementation logic is defined in the RNC document called « RNC-ECSS-M-ST- 10-01 Project planning and implementation »

Relathionships between phases and reviews

The milestones in a project are the reviews (project reviews) which correspond to the key steps toward completing the project.

At the end of each phase, the review is organized in order to provide the information needed to assess the phase in question, officially close it and give the green light to proceed to the next phase.

These reviews are intended to assist the laboratories, manufacturers and satellite Customers in making decisions. Their aim is to verify that:

  • the objectives of the phase have indeed been reached,
  • the results of the phase have indeed been obtained in conformity with the specifications defined during the previous phases.


By virtue of how they are organised, reviews enable potential problems to be critically and independently evaluated, and solutions to be proposed.

The correlation between phases and reviews is given below:



2. Phase 0 and the MDR



3. Phase A and the PRR



4. Phase B and the PDR



5. Phase C and the CDR



6. Phase D and the AR, QR



7. Phase E and the ORR, FRR, OR



8. Phase F and the Removal from Service Review



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