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After Action Review (AAR) is a review technique for appraising ongoing or past operational activity. Part One of this paper identifies the principal components of an AAR-type process and explains how AAR works. It also contains a section on the assumptions underpinning the methodology used for this study. Parts Two, Three and Four each describe the experience of an individual agency or event. Part Five explores the comparative dimensions of the case studies, and lessons learned are described in an Annex