Launched in 2008, the Asian Cities Climate Change Resilience Network (ACCCRN) Initiative aimed to catalyze attention, funding, and action for building the climate change resilience of vulnerable cities and people in Asia. Given that current estimates forecast that about 55 percent of Asia’s population will be living in urban centers by 2030, the ACCCRN Initiative is built on the premise that cities can take actions to build climate resilience – including drainage and flood management, ecosystem strengthening, increasing awareness, and disease control – which can greatly improve the lives of poor and vulnerable people, not just in times of shock or stress, but every day. At the time the initiative was launched, the concept of urban resilience and models for implementing it were nascent and emergent. ACCCRN proved to be an important experiment and “learning lab” for the Foundation and its grantees and partners to build capacity in cities to better understand and implement resilience solutions to the often devastating shocks and stresses of climate change. The initiative was effective in the initial 10 ACCCRN cities and, later, in an additional 40 cities. As part of our Foundation-wide commitment to learning and accountability to our grantees, partners and stakeholders, we undertook an independent evaluation of the work of the initiative in 2014 to assess what worked well and not so well in ACCCRN. Conducted by Verulam Associates and ITAD, who also conducted a mid-term evaluation of the ACCCRN Initiative in 2011, this summative evaluation highlights successes, but also provides an important moment to reflect on the challenges we faced and on what we can do better or differently going forward.