RT Journal Article SR Electronic T1 Designing quality improvement initiatives: the action effect method, a structured approach to identifying and articulating programme theory JF BMJ Quality & Safety JO BMJ Qual Saf FD BMJ Publishing Group Ltd SP 1040 OP 1048 DO 10.1136/bmjqs-2014-003103 VO 23 IS 12 A1 Julie E Reed A1 Christopher McNicholas A1 Thomas Woodcock A1 Laurel Issen A1 Derek Bell YR 2014 UL http://qualitysafety.bmj.com/content/23/12/1040.abstract AB Background The identification and articulation of programme theory can support effective design, execution and evaluation of quality improvement (QI) initiatives. Programme theory includes an agreed aim, potential interventions to achieve this aim, anticipated cause/effect relationships between the interventions and the aim and measures to monitor improvement. This paper outlines the approach used in a research and improvement programme to support QI initiatives in identifying and articulating programme theory: the action effect method. Background to method development Building on a previously used QI method, the driver diagram, the action effect method was developed using co-design and iteration over four annual rounds of improvement initiatives. This resulted in a specification of the elements required to fully articulate the programme theory of a QI initiative. The action effect method The action effect method is a systematic and structured process to identify and articulate a QI initiative's programme theory. The method connects potential interventions and implementation activities with an overall improvement aim through a diagrammatic representation of hypothesised and evidenced cause/effect relationships. Measure concepts, in terms of service delivery and patient and system outcomes, are identified to support evaluation. Discussion and conclusions The action effect method provides a framework to guide the execution and evaluation of a QI initiative, a focal point for other QI methods and a communication tool to engage stakeholders. A clear definition of what constitutes a well-articulated programme theory is provided to guide the use of the method and assessment of the fidelity of its application.