The A3 report has proven to be a key tool in Toyota’s successful move toward organizational efficiency. The power of the A3 report, however, derives not from the report itself, but rather from the development of the dynamic culture required for the implementation of an A3 system. Winner of a Shingo Research and Professional Publication Prize, this manual highlights the deep learning and professional development that occurs in the A3 process. The authors show that the report is especially effective when implemented in conjunction with a PDCA-based management philosophy. It includes practical advice on how to write and review A3 reports.