Figuring out fidelity: a worked example of the methods used to identify critique and revise the essential elements of a contextualised intervention in health policy agencies

摘要

BackgroundIn this paper, we identify and respond to the fidelity assessment challenges posed by novel contextualised interventions (i.e. interventions that are informed by composite social and psychological theories and which incorporate standardised and flexible components in order to maximise effectiveness in complex settings).We (a) describe the difficulties of, and propose a method for, identifying the essential elements of a contextualised intervention; (b) provide a worked example of an approach for critiquing the validity of putative essential elements; and (c) demonstrate how essential elements can be refined during a trial without compromising the fidelity assessment.We used an exploratory test-and-refine process, drawing on empirical evidence from the process evaluation of Supporting Policy In health with Research: an Intervention Trial (SPIRIT). Mixed methods data was triangulated to identify, critique and revise how the intervention’s essential elements should be articulated and scored.