Figures of TRA / TPB

Theory of Reasoned Action, Theory of Planned Behavior

To predict whether a person intends to do something, researchers need to know:

  • Whether the person is in favor of doing it ( 'attitude')
  • How much the person feels social pressure to do it ('subjective norm')
  • Whether the person feels in control of the action in question ('perceived behavioral control')

TRA / TPB are often applied together in health behavior research although it is also common to only apply one of the theories.

TRA Figure 1
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