With the Cognitive Orientation to daily Occupational Performance (CO-OP) approach, children with developmental coordination disorder learn to use a problem-solving strategy to deal with their motor difficulties and perform daily activities of their choice. Therapists use guided discovery to enable children to find their own solutions. Although CO-OP is recommended in a group setting, studies are needed to support its effectiveness.

A single-case study design with multiple baselines across participants and four systematic replications will be used. In each of the five groups, four children (aged 8–12 years) will be randomly included at the baseline. The baseline includes 5–8 measurements, and the CO-OP intervention stage is comprised of 10 sessions. The follow-up stage includes five measurements. Prior to baseline, each child in each of the five groups will choose five activities of which three will be carried out during the intervention sessions. Children’s performance in each of these activities will be scored using the Performance Quality Rating Scale (PQRS) as the main measure. Three secondary measures will be collected: perceived activity performance using the Canadian Occupational Performance Measure, quality of life using the Kidscreen-27 and spontaneous motor rhythm using a computerised typing task. Graphed data will be analysed visually at the individual level with the Visual Aid Implying an Objective Rule (VAIOR) protocol which provides a colour code based on the level and trend of two consecutive phases, facilitating an objective visual analysis. Statistics will be performed for PQRS scores at the individual level and at the group level.

The protocol has been approved by the Comité de protection des personnes Sud-Est I (CPP 2021070) and the Comité d’éthique de la recherche avec les êtres humains de l’Université du Québec à Trois-Rivières (CER-22-294-07.03). Results will be published in a peer-reviewed scientific journal.

NCT05231486.