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Background The conceptualisation of participation is an ongoing discussion with importance for measurement purposes. The aim of this study was to explore the two subjective subdimensions of participation, involvement and engagement. The purpose was related to measure development within the field of paediatric rehabilitation. Methods In a scoping review, following the PRISMA-ScR, the databases MEDLINE, PubMed, Academic Research Complete, PsychINFO, and Business Source Complete were searched for publications that described engagement and/or involvement constructs. Results Thirty-nine publications met the inclusion criteria. Involvement could be conceptualised as an unobservable state of motivation, arousal, or interest towards a specific activity or product. Building a consensus over different fields of research, engagement can be seen as the individual's behavioural, cognitive and affective investment during role performance. Conclusions This scoping review points in a direction that the two subdimensions of participation need to be separated, with involvement being a more stable internal state of interest towards an activity, and engagement referring to the specific behaviour, emotions, and thoughts meanwhile participating in a specific setting. Clear definition of concepts will enhance the development of measures to evaluate rehabilitation interventions in the field of occupational therapy and related fields.