Where is the field of paediatric rehabilitation with respect to developments in the measurement of the participation of children and youth with disabilities in life situations? The aim of this commentary is to provide an overview of perspectives on this issue, touching on the intents of existing measurement approaches, the scope of measurement and the dimensions assessed, populations targeted by the measures and techniques, and how the measurement is done. This commentary therefore considers the why and what, and who and how of participation measurement. Suggestions are made for future opportunities and fruitful directions for measurement in this area. Adapted from the source document.