The document provides guidance on conducting Post Implementation Reviews (PIRs) of government projects in Hong Kong. It aims to help evaluate whether projects achieved their objectives and identify lessons learned to improve future project delivery. The guidance outlines a four-stage model for conducting PIRs that involves defining objectives and scope, determining the review methodology, collecting and analyzing data, and identifying lessons learned and reporting. PIRs help ensure public money is well spent, services are delivered effectively, and accountability is demonstrated.