Background: Exercise referral schemes feature as one of the prevalent primary care physical activity interventions in the United Kingdom, without extensive understanding of how those involved in providing and participating view success. The present research explores and reveals the constituents of "success," through comparison, contradiction, and integration of qualitative and quantitative research findings. Method: A population-based cohort design formed the basis for a mixed method approach to the research. The quantitative component used a three-stage binary logistic regression to identify patient sociodemographic characteristics and referral reasons associated with three outcomes (n = 1,315). The qualitative component (n = 28) comprised...