Abstract: | It is shown that Fishbein's ‘theory of reasoned action’ can be used to explain people's intentions to wear seat belts. As Bentler and Speckart (1979) have proposed, a self-report measure of past behaviour is shown to significantly improve the model's power; this extended Fishbein model being capable of accounting for the majority of the effects that extraneous variables, which are known to influence seat-belt use, have upon a person's behavioural intentions. In addition, it is shown that the model's motivation to comply term is, as Ajzen and Fishbein (1980) have proposed, a unipolar rather than a bi-polar construct, but that even when this construct is scored as unipolar, it does not significantly add to the model's predictive power. |