ABSTRACT The ability to change human behaviour is crucial to solving some of the most existential problems of humanity. Yet, despite the long history of theories of human behaviour, no comprehensive theory of behaviour change exists to guide the development of effective interventions. This article proposes a comprehensive theory of behaviour change that can guide behaviour change intervention development for sustainable tourism. We synthesise existing theories of human behaviour, theories of behaviour change, and intervention studies that generate insights into human behaviour and drivers of change. Based on this collective knowledge, we develop the Targeted Interception Theory of Behaviour Change. It postulates that the effectiveness of different types of intervention varies systematically in dependence on the extent of mental processing associated with the target behaviour. Providing information works for considered but not for habitual and scripted behaviours, the new theory posits. To change such behaviours, some form of active interference or passive disturbance is required. Uniquely, the new theory views behaviour change as a long-term process (not an isolated incident) and assumes the extent of mental processing preceding a behaviour varies from zero to 100% (rather than being binary).
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