The document describes a large scale agile transformation at a global retailer. It discusses why the transformation was undertaken due to issues like long development times and quality problems. It then details how the transformation was implemented over several phases, including piloting agile practices, establishing agile roles and processes, and ongoing improvements. The transformation was considered successful, leading to benefits like reduced time to market, increased innovation, and becoming an employer of choice. The lesson learned is that organizations should understand their reasons for transforming before embarking on the journey.