The concept, theory of planned behaviour (Theory of Planned Behavior: TPB) proposed by Ajzen has developed since 1985 as a social psychological theory (Social psychology) that developed from the theory of action-with reason (Theory of Reasoned Action) of Ajzen and Fishbein (1975), this theory explains human behavior that are caused by point 3 beliefs: beliefs about the behavior (Behavioral beliefs) beliefs about groups of references (Normative beliefs), and beliefs about their ability to control (Control beliefs), in which individual beliefs would affect a variable (Ajzen, 1991).
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