The Paris Agreement established a global goal on adaptation and invites parties to review the effectiveness of adaptation actions. However, the measurement of adaptation success remains elusive. Focusing on the capabilities of households and governments to pursue a range of adaptation futures provides a more robust foundation. The Paris Agreement established a global goal on adaptation (Article 7, para. 1) and invites Parties to "review the adequacy and effectiveness of adaptation" in a global stocktake (Article 7, para 14c). However, creating universally applicable measures of adaptation success remains elusive given that most adaptation projects are implemented at the local level, and start from wildly differing baseline conditions. Further, the adaptation process is never truly "finished" in a changing, evolving climate 1. Berrang-Ford et al. 2 propose tracking government adaptation policy instruments as a way to assess progress. However, these and other approaches do not address what constitutes "success", focusing instead on government planning, or how vulnerability is changing-leaving open the question of vulnerability of whom, This comment evolved from a special session on adaptation success convened by the authors at Adaptation Futures 2018, the 5th International Climate Change Adaptation Conference in Cape Town. We thank the over 100 session participants from around the world, including participants from government agencies, donors, non-governmental organizations, students, humanitarian agencies, academics, policy-makers and members of civil society.