"As policy-makers, commissioners and providers look to innovate and develop new ways of delivering care, there is increasing recognition at both national and local levels about the importance of understanding what works, why it works, and to demonstrate impact on cost and patient outcomes. One of the recurrent problems when evaluating the impact of new care models on outcomes is how to know ‘what would have happened under a different approach to delivering care’."
Evaluation of complex health and care interventions using retrospective matched control methods: A guide for evaluators
A Davies, C Ariti, T Georghiou, M Bardsley
Nuffield Trust
August 2015
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