According to Ogden (2003) health psychology theories, social cognition models in particular, do not meet “the criteria set for a good theory. If they are to be given the status of theories, then it is recommended that the critical eye that psychologists place on other areas of research also be cast on this one.” More recently Sniehotta (2014) has suggested that “The Theory of Planned Behaviour (TPB) is no longer a plausible theory of behaviour or behaviour change” and should be “retired.” Your task is to cast a critical eye on the TPB and come to your own conclusion as to whether it should be retired or not. In doing so, you may want to consider some of the following questions: what is the conceptual basis of the model; how does it conceptualise the determinants of behaviour and behaviour change; what is the empirical evidence for the model and its components; are there other factors that might be equally important in determining behaviour, at the individual, group and/or population level, that the model does not include; does it or does it not meet the criteria for a “good” theory; can a theory be useful even if it is not “good”; how does research and theory in other fields, such as neuropsychology, philosophy and sociology complicate or even contradict the model? Your answer should conclude by describing how you think research in the area of predicting and changing behaviour might best progress, and if that progress involves modifying and improving the TPB or abandoning it all together.
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