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The Theory of Planned Behaviour was proposed by Ajzen (1985) in an attempt to expand the applicability of the Theory of Reasoned Action (TRA) to situations where behaviour is not under complete volitional control. However, recent research does not address the issue of the stability of intentions, yet this is considered a boundary condition of the TRA on theoretical grounds. Therefore, the purposes of the present article were, first, to make a theoretical approach to the study of the stability of behavioural intentions by discussing assumptions underlying self-determination theory. Second, because, according to self-determination theory (Deci & Ryan, 1985), stability of intentions is related to the functional significance of psychological events, investigation of the functional significance of attitudes, subjective norms and perceived behavioural control was attempted through a study dealing with leisure-time physical activity. Because investigation of functional significance requires instruments assessing behavioural regulations, instrument development took place. Results partially supported the validity of behavioural regulations with respect to leisure-time physical activity. Furthermore, subjective norms were found to represent only the controlling dimension of functional significance. Attitudes and perceived behavioural control were found to represent both the controlling and informational dimensions of functional significance. Results are discussed in relation to assumptions underlying the Theories of Reasoned Action and Planned Behaviour and the Theory of Trying. Implications for theory development are made. © 1998 John Wiley & Sons, Ltd.
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