Preliminary Design Review. A review conducted to evaluate the progress, technical adequacy, and risk resolution of the selected design approach for one or more configuration items; to determine each design's compatibility with the requirements for the configuration item; to evaluate the degree of definition and assess the technical risk associated with the selected manufacturing methods and processes; to establish the existence and compatibility of the physical and functional interfaces among the configuration items and other items of equipment, facilities, software, and personnel; and as appropriate, to evaluate the preliminary operation and support documents. (IEEE Standard 610.12-1990) For CSCIs, the review will focus on: (1) the evaluation of the progress, consistency, and technical adequacy of the selected architectural design and test approach, (2) compatibility between software requirements and architectural design, and (3) the preliminary version of the operation and support documents.