| الملخص: | <p><strong>Objectives:</strong><br/> Although many health interventions are delivered in groups, it is unclear how group context can be best used to promote health‐related behaviour change and what change processes are most helpful to participants. This study explored participants’ experiences of attending type 2 diabetes prevention and management programme, and their perceptions of how group participation influenced changes in diet and physical activity.</p><br/> <p><strong>Design:</strong><br/> Qualitative.</p><br/> <p><strong>Methods:</strong><br/> Semi‐structured telephone interviews were conducted with 20 participants (twelve men) from nine groups in the Norfolk Diabetes Prevention Study. Interviews were audio‐recorded, transcribed verbatim, and analysed using thematic analysis in NVivo.</p><br/> <p><strong>Results:</strong><br/> Participants benefited from individual change processes, including information provision, structuring and prioritizing health goals, action planning, self‐monitoring, and receiving feedback. They also benefited from group processes, including having a common purpose, sharing experiences, making social comparisons, monitoring and accountability, and providing and receiving social support in the groups. Participants’ engagement with, and benefits from, the groups were enhanced when there was a supportive group context (i.e., group cohesion, homogeneous group composition, and a positive group atmosphere). Optimal facilitation to develop an appropriate group context and initiate effective change processes necessitated good facilitator interpersonal and professional skills, credibility and empathy, and effective group facilitation methods. Participants reported developing a sense of responsibility and making behaviour changes that resulted in improvements in health outcomes and weight loss.</p><br/> <p><strong>Conclusions:</strong><br/> This study highlights the role of individual and group processes in facilitating health‐promoting behaviour change, and the importance of group context and optimal facilitation in promoting engagement with the programme.</p><br/>
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