An example for the development of a potential Minimum Data Set (MDS) within the Urban Vitality (UV) themes ‘Gezond ouder worden / Mensen in Beweging’. The goal is to ensure more uniform collection of outcome measures, based on FAIR principles (ref 1), and to facilitate reuse of data and analyses spanning multiple studies. This prototype MDS is based on The Older Persons and Informal Caregivers Survey Minimum DataSet (TOPICS-MDS) (ref 2), the project FAIR: geen woorden maar data (ref 3) in which we examined 14 UV-studies about ageing and frailty of elderly, and the set of common data elements for rare disease registration (ref 4).