Abstract
Revaluation is an innovative process for measuring the full value of activity in complex systems. It is a new approach, developed in the context of NHS Change Day 2015, a grassroots social movement for improving patient experience. The organisers of Change Day felt it was impossible to evaluate – based in part on having tried to do so in previous years – and framed the research task as one of "reimagining evaluation". Revaluation has since been applied in diverse settings including work on the natural environment, encouraging physical activity, and family nursing. It is continuously being refined through practice. Revaluation is centrally concerned with revealing the value of an activity or intervention in a complex system. Rather than asking "what works", its first question is "what is going on?" For this and other reasons, Revaluation has been described both as "a paradigm shift in evaluation" and "not evaluation".