Study Protocol: Shared Achievements: Exploring the Design of Gameful Collaborative Elements and Fostering Social Relatedness through Team Effort Contributions in a Social Physical Activity App

This study protocol outlines the design and methodology of a research study investigating collaborative game elements to promote physical activity within digital health interventions. The study aims to examine how social relatedness influences motivation and adherence to step-count goals. Participants will use Shared Achievements, a minimalistic multiplayer step counter game, over two weeks, one week contributing absolute step counts and one week sharing step counts as a relative percentage of a team goal. Data will be collected through usage metrics and participant feedback to evaluate engagement, motivation, and perceived challenges. Findings will inform the design of digital health tools that balance competition and collaboration, optimising social and behavioural support mechanisms.