The document discusses the evolution of an organization's use of Kanban over several years to improve their product development process. They initially used Kanban boards to visualize work but found issues with requirements changing and work not being well-defined. They developed upstream Kanban boards to provide more visibility into planning and prioritization. This included separating planning from execution and using boards to manage roadmaps, backlogs, and workflows. The changes resulted in reduced cycle times, increased throughput, improved collaboration, and better representation of all functions' work.