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Basics of qualitative research: Grounded theory procedures and techniques

The Theory of Planned Behaviour (TPB) has received considerable attention in the literature. The present study is a quantitative integration and review of that research. From a database of 185 independent studies published up to the end of 1997, the TPB accounted for 27% and 39% of the variance in behaviour and intention, respectively. The perceived behavioural control (PBC) construct accounted for significant amounts of variance in intention and behaviour, independent of theory of reasoned action variables. When behaviour measures were self-reports, the TPB accounted for 11% more of the variance in behaviour than when behaviour measures were objective or observed (R2s = .31 and .21, respectively). Attitude, subjective norm and PBC account for significantly more of the variance in individuals' desires than intentions or self-predictions, but intentions and self-predictions were better predictors of behaviour. The subjective norm construct is generally found to be a weak predictor of intentions. This is partly attributable to a combination of poor measurement and the need for expansion of the normative component. The discussion focuses on ways in which current TPB research can be taken forward in the light of the present review.

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Efficacy of the Theory of Planned Behaviour: a meta-analytic review.

Preface Chapter 1 The challenge Chapter 2 The nature of the evidence: A synthesis of meta-analyses Chapter 3 The argument: Visible teaching and visible learning Chapter 4: The contributions from the student Chapter 5 The contributions from the home Chapter 6 The contributions from the school Chapter 7 The contributions from the teacher Chapter 8 The contributions from the curricula Chapter 9 The contributions from teaching approaches - I Chapter 10 The contributions from teaching approaches - II Chapter 11: Bringing it all together Appendix A: The 800 meta-analyses Appendix B: The meta-analyses by rank order References

Visible Learning: A Synthesis of Over 800 Meta-Analyses Relating to Achievement

Conceptual and methodological ambiguities surrounding the concept of perceived behavioral control are clarified. It is shown that perceived control over performance of a behavior, though comprised of separable components that reflect beliefs about self-efficacy and about controllability, can nevertheless be considered a unitary latent variable in a hierarchical factor model. It is further argued that there is no necessary correspondence between self-efficacy and internal control factors, or between controllability and external control factors. Self-efficacy and controllability can reflect internal as well as external factors and the extent to which they reflect one or the other is an empirical question. Finally, a case is made that measures of perceived behavioral control need to incorporate self-efficacy as well as controllability items that are carefully selected to ensure high internal consistency.

Summary and Conclusions
Perceived control over performance of a behavior can account for consider- able variance in intentions and actions. However, ambiguities surrounding the concept of perceived behavioral control have tended to create uncertainties and to impede progress. The present article attempted to clarify conceptual ambiguities and resolve issues related to the operationalization of perceived behavioral control. Recent research has demonstrated that the overarching concept of perceived behavioral control, as commonly assessed, is comprised of two components: self-efficacy (dealing largely with the ease or difficulty of performing a behavior) and controllability (the extent to which performance is up to the actor). Contrary to a widely accepted view, it was argued that self-efficacy expectations do not necessarily correspond to beliefs about internal control factors, and that controllability expectations have no necessary basis in the perceived operation of external factors. Instead, it was suggested that self-efficacy and controllability may both reflect beliefs about the presence of internal as well as external factors. Rather than making a priori assumptions about the internal or external locus of self-efficacy and controllability, this issue is best treated as an empirical question.

Also of theoretical significance, the present article tried to dispel the notion that self-efficacy and controllability are incompatible with, or independent of, each other. Although factor analyses of perceived behavioral control items provide clear and consistent evidence for the distinction, there is sufficient commonality between self-efficacy and controllability to suggest a two-level hierarchical model. In this model, perceived behavioral control is the overarching, superordinate construct that is comprised of two lower-level components: self-efficacy and controllability. This view of the control component in the theory of planned behavior implies that measures of perceived behavioral control should contain items that assess self-efficacy as well as controllability. Depending on the purpose of the investigation, a decision can be made to aggregate over all items, treating perceived behavioral control as a unitary factor, or to distinguish between self-efficacy and controllability by entering separate indices into the prediction equation.

Perceived Behavioral Control, Self-Efficacy, Locus of Control, and the Theory of Planned Behavior

This paper describes and reviews the theory of planned behavior (TPB). The focus is on evidence supporting the further extension of the TPB in various ways. Empirical and theoretical evidence to support the addition of 6 variables to the TPB is reviewed: belief salience measures, past behaviodhabit, perceived behavioral control (PBC) vs. selfefficacy, moral norms, self-identity, and affective beliefs. In each case there appears to be growing empirical evidence to support their addition to the TPB and some understanding of the processes by which they may be related to other TPB variables, intentions, and behavior. Two avenues for expansion of the TPB are presented. First, the possibility of incorporating the TPB into a dual-process model of attitude-behavior relationships is reviewed. Second, the expansion of the TPB to include consideration of the volitional processes determining how goal intentions may lead to goal achievement is discussed.

Extending the Theory of Planned Behavior: A Review and Avenues for Further Research

A number of social cognition models have been developed to account for socio-demographic variations in health behaviour. This paper distinguishes between: (a) motivational, (b) behavioural enaction, and (c) multi-stage models of health behaviour. The models are evaluated in terms of advancement of existing knowledge and - where appropriate - predictive utility. Common themes that appear within- and between- these categories are discussed, with consideration of ways in which theory may be advanced by future research. Each approach has associated strengths and weaknesses, suggesting that a “consensus” approach to the study of health behaviour may prove fruitful. Identification of the key constructs across different model types would allow coherent integration and promote further understanding of the psycho-social determinants of health behaviour.

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Social cognition models and health behaviour: A structured review

The aims of the present study are fourfold: to apply the theory of planned behavior (TPB) to eating a low-fat diet; to consider differences between self-efficacy and perceived control over behavior (PCB); to examine self-identity as a potential addition to the model; and to identify beliefs which may provide useful targets for interventions. Findings support the efficacy of the TPB as a predictor of low-fat diet. Evidence for the distinction between self-efficacy and PCB was provided by principal components analysis, patterns in prediction of intention, and the control beliefs associated with the two constructs. Self-identity was found to independently predict intention and may prove a useful addition to the TPB. Finally, specific beliefs distinguished intenders from nonintenders, providing potential targets for health interventions. The findings are discussed in the context of previous TPB research and the need for multimethod assessments of behavior.

Distinguishing Perceptions of Control From Self‐Efficacy: Predicting Consumption of a Low‐Fat Diet Using the Theory of Planned Behavior

The theory of planned behaviour (TPB) has received considerable attention in the literature. However, there have been few attempts to assess the proposed causal links between beliefs, attitudes, intentions and behaviour. The present study was designed to assess the predictive validity and causal ordering of TPB constructs over a 3-month period. Findings indicated good internal and test-retest reliability of assessed components; evidence for a distinction between two processes of perceived behavioural control (self-efficacy and perceived control); support for inclusion of self-identity into the model; and predictive validity of the TPB over 3 months. Perhaps more importantly, there was some evidence to support causal ordering between predicted TPB variables. In particular, cross-lagged panel correlation analysis supported the causal impact of self-efficacy on intention. The present study supports the use of the TPB as a reliable predictor of intentions and behaviour over time. It also highlights the need for further research on the relationship between attitudes, perceived behavioural control and their underlying beliefs.

Christopher J. Armitage

Papers

Efficacy of the Theory of Planned Behaviour: a meta-analytic review.

Extending the Theory of Planned Behavior: A Review and Avenues for Further Research

Social cognition models and health behaviour: A structured review

Distinguishing Perceptions of Control From Self‐Efficacy: Predicting Consumption of a Low‐Fat Diet Using the Theory of Planned Behavior

The theory of planned behaviour: Assessment of predictive validity and 'perceived control