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Mental Health Link - a facilitated programme - aimed to develop systems within primary care and links with specialists to improve care for patients with long-term mental illness. A process evaluation based on Pawson and Tilley’s Realistic Evaluation complemented a randomized controlled trial. This article describes the method developed for this ‘realistic evaluation’, the mechanisms behind the integration of linked specialist workers and discusses practical and theoretical issues arising from the use of the realistic evaluation framework as a way of explaining the results of trials and service development. Retrospective interviews identified the important outcomes and were used to construct ‘Context-Mechanism-Outcome’ configurations. The 12 case studies represented what had happened. A second-level analysis using analytic induction developed ‘middle range theories’ designed to be of value to those developing care elsewhere. The intervention was successful in stimulating productive joint working, through case discussions, but often failed to ensure a review of progress.
Byng et al. (Sat,) studied this question.