Recognizing the importance of integrating diverse knowledge systems in adaptation responses, and in order to support Parties in this endeavor, members of the Adaptation Committee's Taskforce on National Adaptation Plans (NAPs) decided to prepare this policy brief to provide information on good practices, lessons learned, challenges and opportunities in the application of traditional knowledge, knowledge of Indigenous Peoples and local knowledge systems (TILKS) in adaptation, to inform practitioners and policymakers in their adaptation planning and implementation efforts, as well as constituted bodies under the UNFCCC and other key stakeholders to further incorporate these knowledge systems into their work.