Abstract

The application of extended Theory of Planned Behaviour (eTPB) has been demonstrated in various studies. The successful implementation of the extended Theory of Planned Behaviour (eTPB) will require better understanding of the rationales for the application in context. The paper presentation emerges from an interpretive and descriptive study which generated qualitative data through systematic literature review and document analysis. Thematic analysis was deployed to identify emerging and dominating themes as a focus for the interpretation. The analysis confirmed that extended theory of planned behaviour explains behaviour through attitudes, subjective norms, and perceived behavioural control and is capable of predicting and understanding human behaviour across various domains. However, the use of Theory of planned behaviour has been extended to enhance the predictive power of the model in understanding and influencing behaviours. Additional variables have emerged on top of the usual variables known as attitude towards the behaviour, subjective norms towards the behaviour, and perceived behaviour control. Still, the paper argues that although the diversity in variables exist among authors showing flexibility of the theory, this may create some confusion which may influence the capability of predicting and understanding human behaviour across various domains. The Theory of planned behaviour trend reflects that the choice of Theory of planned behaviour variables is determined by appropriateness and according to the context. Therefore, the paper argues that there are many variables for theory of planned behaviour but the dominant to be considered are clear knowledge and understanding ahead of all variables.