Theory of Planned Behaviour

• Theory of planned behaviour -> personal attitudes, subjective norms, perceived behavioural control.
• Personal attitudes -> balance of the person's favourable and unfavourable judgements of own behaviour.
• Subjective norms -> a person's belief about whether people who matter to them approve or disapprove of their behaviour.
• Perceived behavioural control (PBC) -> how much control we believe we have over our own behaviour.
• Evaluation of theory of planned behaviour (positives) -> practical uses - interventions to tackle substance addictions should aim to increase clients' perceived control over their behaviour.
• Evaluation of theory of planned behaviour (negatives) -> lacks effectiveness (cannot account for the intention-behaviour gap- where although people can fully intend to make a behaviour change, they still do not).