Pawel Brodzinski introduces the concept of Portfolio Kanban as a backdoor to organizational evolution. Portfolio Kanban addresses problems that arise from taking on too many concurrent projects, including context switching costs, lower quality work, and emergencies. It uses a visual board to manage total capabilities, commitments, and work in progress limits across all projects. Implementing Portfolio Kanban can result in fewer ongoing projects, fewer emergencies, healthier team work environments, and more slack time for teams.