The Preliminary Design Review (PDR) is a technical assessment that establishes the physically Allocated Baseline of a system to ensure a system in operationally effective.  This review assesses the allocated design documented in subsystem product specifications for each configuration item in the system and ensures that each function, in the Functional Baseline, has been allocated to one or more system configuration items. The PDR establishes the allocated baseline (hardware, software, human/support systems) and underlying architectures to ensure that the system under review has a reasonable expectation of satisfying the requirements within the currently allocated budget and schedule.

Acquisition System

For complex systems, a PDR may be conducted incrementally for each configuration item. These incremental reviews lead to an overall system level PDR. System level performance is supported by compliance with Interface Control Dcuments, but not assured. Interface requirements make up each configuration item Allocated Specification.

The Weapons System Acquisition Reform Act of 2009 directed the PDR to: 

  • PDRs before Milestone (MS) B are mandatory for all Major Defense Acquisition Programs (MDAP) and will be reflected in the Technology Development Strategy (TDS) to be approved by the MDA at MS A. Post-PDR assessments will be conducted in association with MS B preparations and will be formally considered by the Milestone Decision Authority (MDA) at the MS B certification review.
  • The timing of PDRs for other than MDAPs will be approved by the DoD Component MDA when consistent with TDS or Acquisition Strategy objectives. When the PDR is conducted before MS B, a post-PDR assessment will be conducted in association with the MS B review and formally considered by the MDA at the MS B review. If the PDR is conducted after MS B, the MDA will conduct a post-PDR assessment at a time reflected in the approved acquisition strategy.
  • PDR before MS B is now a statutory requirement for MDAPs. The post-PDR assessment will be conducted during the MS B review, and prior to the section 2366b certification by the MDA per title 10, Unites States Code.

Completion of the PDR should provide the following:


  • The Program Manager (PM) should conduct the PDR when all major design issues have been resolved and work can begin on detailed design. The PDR should address and resolve critical, system-wide issues.
  • The PDR should be conducted when the allocated baseline has been achieved, allowing detailed design of hardware and software configuration items to proceed. A rule of thumb is that 10 percent to 25 percent of product drawings and associated instructions should be complete, and that 100 percent of all safety-critical component (Critical Safety Items and Critical Application Items) drawings are complete.

AcqLinks and References:

Updated: 7/11/2017

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