LAY ABSTRACTParticipation is defined by the International Classification of Functioning, Disability and Health (ICF) as "involvement in a life situation"'. For this concept to be used in rehabilitation, some issues require clarification. When aiming to use this concept and to measure participation it is necessary: (i) to define the context (home, school, work, community, etc.) in which the patient (child, adult or older person) wants to participate; (ii) to make clear in what dimension exactly one wants to measure participation: the frequency, the limitations, the subjective appraisal of activities, or combinations of these; and (iii) to be aware of the level of power and autonomy the patient aims for in performing activities: from being informed about the activity to being involved in decisionmaking. Based on the results of this study, a more informed choice could be made about which measurement instrument to use. However, a clear single agreement on the concept of participation will foster clinical practice and action is required to reach consensus.