The document discusses the Activity Sort Cards, which is a self-report assessment that measures participation in social, instrumental, and leisure activities for older adults. It consists of 89 photograph cards grouped into categories and allows participants to sort cards based on their level of engagement. The ACS is a well-established measure that can be used for initial assessment, goal setting, and evaluating interventions aimed at increasing participation. However, it does not provide information on factors like time spent, frequency, social interactions, or difficulty level of activities.