A systems requirements review (SRR), preliminary design review (PDR), and critical design review (CDR).

系统需求检查(systems requirements review, SRR)，初步设计检查(preliminary design review, PDR)，和关键设计检查(critical design review, CDR)。

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The Orion capsule, which is intended to carry at least four astronauts into Earth orbit and beyond, has completed its preliminary design review, or PDR.

BBC: Spaceship passes critical review

Orion has just passed its preliminary design review and a test version of the Ares 1 stands ready at the Kennedy Space Centre for a demonstration flight in October.

BBC: Underfunding shackles Nasa vision

The completion of the so-called System Requirements Review and System Definition Review allows program managers to proceed into the rocket's preliminary design phase, NASA officials said.

MSN: Giant deep-space rocket passes key test - Technology & science - Space - Space.com | NBC News