Co-production is essential to ensure patient needs are identified, outcomes met and implementation achieved. A modified Delphi approach involving key stakeholders was used to: identify and prioritise outcomes of importance in relation to Virtual Reality (VR) technology design in order to address clinical issues; define outcome measures/develop bespoke project measures; and determine clinical trial design. Results reflect three key themes of motivation for system design and evaluation: autonomy, relatedness and competence. Young people with disabilities and their families have invaluable contributions to the design and implementation of VR technologies in rehabilitation.