Realist Review of Interventions Influencing Waste Management and Minimization Practices in New Zealand: Protocol and Initial Program Theory

Background: The effects of waste on the environment and human health continue to increase despite behavioral, technological and policy actions for the management and minimization of waste. We plan to undertake a realist review of waste management and minimization interventions within New Zealand to inform effective approaches to waste minimization and management interventions. This protocol paper describes the steps of the realist review, including the objectives, theoretical frameworks and steps used. Methods: Realist review is a theory guided approach that seeks to understand the context-mechanism-outcome configuration of an intervention and generate insights on what works for whom, under what conditions and how. The protocol presents an integrated working theoretical framework comprising of three social theories (Social Learning Theory, Collective Action Theory and Social Practice theory), set within an indigenous Māori implementation framework, He Pikinga Waiora. The initial program theory generated from a first stage rapid review is presented. This initial program theory will be tested through a full literature review and analysis, as well as participatory sense making workshops with key stakeholders. Discussion: The review will help to generate insights on the generative causal mechanisms of waste minimization interventions in the context of New Zealand. This protocol emphasizes the initial program theory of change as a starting point for further review and design of improved interventions for waste minimization. Through identifying and testing the program theory, with insights from both indigenous and social practice theories, the proposed review will support the design of policies, programs and activities required to achieve the desired outcome of waste minimization in the context of New Zealand.