Evaluating the effectiveness of adaptation policies and actions is important to advance the scale and scope of climate risk reduction. The goal of this WASP Sciencefor-Adaptation Policy Brief (SAPB) is to enhance the understanding of the effectiveness of climate adaptation by elucidating the dynamic framing for adaptation policy and action, identifying areas where approaches for ensuring adaptation effectiveness have advanced, highlighting adaptation effectiveness in international and national policymaking and measuring adaptation effectiveness of actions on the ground.