preliminary design review

基本解释

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）
As the design input and review activities progress, any conflicts are resolved and the preliminary specifications for the device, accessories, labeling, and packaging are established.
随着设计输入和审查活动的进步，冲突得到了解决，器械、附件、标识和包装的初始规格得到了建立。
blog.sina.com.cn
Specifying processes design for new programs and determine process proposal, provides capital estimation on all equipments and toolings and complete preliminary MPPS for department Manager's review.
定义新项目的工艺流程设计并确定工艺方案，为所有的设备和工装夹具提供资本评估并完成初步的投资分析交给部门经理评审。

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