The Theory of Planned Behaviour

The theory of planned behaviour

The processes by which people deliberately decide to engage in a specific action

What are the three factors that converge to predict behavioural intentions

1. WHAT

2. WHAT

3. WHAT

What are the three factors that converge to predict behavioural intentions

1. Attitudes

2. Subjective norms

3. Percieved control

Attitudes

Attitudes are determined by one’s beliefs and one’s evaluations about the consequences of performing the behaviour

Subjective norms

The perceived expectations of significant others who may approve or disapprove of the planned behaviour

Perceived control

One’s perception of how easy or difficult it is to perform the behaviour

These three factors combine in an interactive way to determine WHAT which in turn determines WHAT (this is what behavioural intention is) 

These three factors combine in an interactive way to determine BEHAVIOURAL INTENTIONS which in turn determines BEHAVIOUR (this is what behavioural intention is) 

WHAT and WHAT cannot predict behaviour alone, whereas WHAT can

ATTENTION and SOCIAL NORMS cannot predict behaviour alone, whereas PERCEIVED CONTROL can

Meta-analysis (Armitage and conner) reported that the standard theory of planned behaviour components account for roughly two-thirds of variance in intentions and behaviour across a range of domains - this led to the proposal of other variables such as

1. WHAT

2. WHAT

3. WHAT

Meta-analysis (Armitage and conner) reported that the standard theory of planned behaviour components account for roughly two-thirds of variance in intentions and behaviour across a range of domains - this led to the proposal of other variables such as

1. behaviour or habits

2. Self-identity

3. Anticipated emotions

WHAT emerges as the weakest predictor of intentions and place focus on others like WHAT - which have been shown to increase the variance in intentions over the standard theory of planned behaviour (for condom use, dietary behaviours and blood donations)

SUBJECTIVE NORMS emerges as the weakest predictor of intentions and place focus on others like MORAL NORMS - which have been shown to increase the variance in intentions over the standard theory of planned behaviour (for condom use, dietary behaviours and blood donations)