The post-project assessment is an important, yet frequently overlooked stage of project management. Projects represent a high investment for most organizations and the effective use of post-project assessments is likely to be one of the most reliable ways of reducing the risk of project failure and maximizing the business value of the project management function. Sometimes referred to by alternative names such as project review, project debrief and even the dismal-sounding “post mortem”, the post project assessment allows lessons learned from projects to be identified and documented as organizational knowledge. This article describes an art and science based system for conducting post-project assessments and discusses a case study application of the system and the types of lessons learned.