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Theory of Planned Behaviour - Coggle Diagram
Theory of Planned Behaviour
Model:
Behaviour <
Intention <
Personal Attitude
Subjective Norms
Perceived Behavioural Control (Self efficacy)
The changes in behaviour that can be predicted from our intention to change
Definitions:
Personal Attitude
- What is the addict's attitude towards their behaviour? Favourable? Unfavourable?
e.g "Gambling is a quick and easy way of making loads of money"
Subjective Norm
- The addict's belief about what the people close to them think about their addiction
e.g "Everyone I know gambles a bit, look how popular the lottery is"
Perceived Behavioural Control
- Whether or not the addict believes they are capable of abstaining - do they think it would be hard or easy for them = self efficacy? - Depends partly on resources they believe they have available and past experiences
e.g "No-one is forcing me to do this, I am making my own decision. I am fully in control of my actions"
Evaluation:
Hagger et al:
tested alcohol related behaviours
Found that personal attitudes, subjective norms, and PBC all correlated with an intention to limit drinking
Intentions also correlated with the amount drunk
PBC predicted behaviour directly
W - Questionnaires to measure attitude is social desirability
W - Measuring alcohol intake is recall/honesty
The fact that PBC directly affected behaviour means it's the most central bit of the model
Miller & Howell (2005):
TPB predicted intentions but not actual gambling behaviour (in teenagers)
Some believe TPB doesn't predict behaviour change at all
Cannot account for
intention behaviour gap
- describes the discrepancy between what a person intends to do and what they actually do
TPB - rational - ignores emotions and compulsions