Theory of Planned Behavior

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summary of TPB relationships

-TPB has better predictive power than TRA -attitude, PBC, and subjective norm are better predictor of intention than behavior -relationships with intention: -attitude (large) -perceived behavioral control (large) -subjective norm (weaker relationship than attitude or PBC)

main difference between TRA and TPB

-TRA does not have control beliefs/PBC

constructs

-attitudes -subjective norms

belief based structures

-behavioral beliefs -normative beliefs -control beliefs

perceived behavioral control

-degree of personal control the individual believes they have over the behavior -informed by control beliefs (expectancy x value) -expectancy: presence of absence of barriers/facilitators -value: ability of barriers and facilitators to impact behavior -influences behavior directly and indirectly (through intentions)

development of TRA/TPB

-long history of poor results using attitudes to predict behavior -FIshbein and Ajzen (TRA:1975; 1980) (TPB: 1985; 1988) -assess attitudes toward specific behavior -added idea of intention preceding behavior -commonly used by 1980s -another value-expectancy theory -expectancy: beliefs about PA -value: relative importance of those beliefs

formation of attitudes

-teen/early adult years -influence by important others -resistant to change

intention

-most proximal determinant of behavior -person's willingness and how much effort they are willing to exert to perform the behavior -function of attitudes, social norms, and PBC (in TPB) -intention and time? -intention and behavior?

assumptions of TRA/TPB

-people weigh consequences and implications of their actions and then decide whether to act -pros vs cons -rational decisions? -intention must be highly correlated with behavior

subjective norms

-perceived social pressure that individuals feel to perform or not perform a particular behavior -informed by normative beliefs (expectancy x value) -expectancy: perceived expectations of important significant others or groups -value: individual's motivation to comply with the expectations of important others

attitudes

-positive or negative evaluation of performing a behavior -informed by behavioral beliefs (expectancy x value) -expectancy: perceived consequences of carrying out a specific action -value: personal evaluation of each of these consequences

attitudes towards PA

-positive: good, beneficial, enjoyable, advantageous -negative: bad, not enjoyable, time consuming, painful

TPB strength and weaknesses

-strengths: -good predictor of short term intention/behavior -frequently used to understand physical activity behavior -used in a wide variety of contexts -weaknesses: -limited by time between intention and behavior -not designed as a theory of behavior change


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