This document discusses leadership and change management in complex health systems. It begins by outlining where change efforts can go wrong, such as weak design and implementation. It then provides guidance on strengthening design through co-design and considering implementation. The document emphasizes that change must be led and managed, occurring through people. It discusses the importance of building commitment to change through sensemaking, communication, and addressing people's values. It also recommends embracing complexity and learning through small wins and feedback loops to increase the chances of success in health system strengthening efforts.