What does 6.6 require?

In phase C the supplier's system engineering function establishes the detailed definition of the system, demonstrates that it can satisfy the system technical requirements specification, supports the Critical Design Review and sees that its actions are implemented.

ECSS-E-ST-10C System Engineering General Requirements...

Other controls in Clause 6: System engineering activities by project phase – ECSS-E-ST-10C System Engineering General Requirements (2009 edition)

6.2 Plan and monitor system engineering activities by project phase and identify critical elements
6.3 Phase 0: support need identification and propose system concepts
6.4 Phase A: finalise the needs and propose solutions with their risks
6.5 Phase B: establish the preliminary definition and demonstrate it meets the requirements
6.7 Phase D: complete qualification and acceptance and prepare for operations
6.8 Phase E: support the launch campaign, operations and anomaly resolution
6.9 Phase F: support disposal and the Mission Close-out Review

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MCP endpoint All ECSS-E-ST-10C System Engineering General Requirements (2009 edition) controls