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.