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Theory of Reasoned Action (TRA) Lindsay Miller Oregon State University.

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Presentation on theme: "Theory of Reasoned Action (TRA) Lindsay Miller Oregon State University."— Presentation transcript:

1 Theory of Reasoned Action (TRA) Lindsay Miller Oregon State University

2 Outline Brief discussion of Value-expectancy theory Overview of the Theory of Reasoned Action George’s example from book Personal example that YOU will help me walk through Short quiz of TRA Relationship between TRA and TTI

3 Value-expectancy TRA has value-expectancy Explains, “how individuals make health-behavior decisions in terms of their expectations or beliefs regarding the health behavior and the value attached to the behavioral health outcome” Theory of Planned Behavior The Information-Motivation-Behavioral Skills Model

4 Theory of Reasoned Action (TRA) Overview TRA was developed by Ajzen and Fishbein focuses (constructs) o Beliefs about HBs will shape behavioral intent  Attitude o Social influences will shape behavioral intent  Subjective Norm

5 TRA Overview Construct 1: o Attitude: A person’s evaluation of the anticipated positive or negative outcomes associated with engaging in a given behavior. o Consider belief about behavior and evaluate that behavior as good or bad. o 7 point scale: -3 to +3 o Create attitude about behavior

6 TRA Overview Construct 2: o Subjective Norm: The idea that people are motivated by their perceptions of what is considered normative and acceptable by others o Normative belief: The perceptions that an individual has about what others think they should do in regards to the said behavior. o Weigh each normative belief by a person’s motivation to comply with the referent (source of the normative belief) o 7 point scale: 1-7 o Create Subjective Norm

7 TRA Overview Behavioral Intent: o Key construct in TRA and the last step before the actual behavior o Defined very specifically as, 1.Time frame for performance of the behavior 2.And exact description of the action composing the behavior 3.The desired outcome (target) of the behavior, 4.The context of the behavior o Example: “intent to use condoms for STD prevention (target) in the next 6 months (time) for every act of penile-vaginal sex (action) with people other than your primary sex partner (context).

8 TRA Diagram

9 George Example from Text George wants to lower cholesterol levels Considers few options o Diet change o Exercise o Take cholesterol-lowering drugs Doc suggests changing diet

10 Belief about becoming a vegetarian o May have difficult time finding enough food Evaluate his belief o Good versus bad o 7 point scale: -3 to +3 o Not finding enough food (-3) Create attitude about behavior George Example – Construct 1

11 George Example Construct 2 People are motivated by their perceptions of what is considered normative and acceptable to others. Each normative belief is “weighted” by a persons motivation to comply with referent source o 7 point scale (1-7) Georges doctor believes he should take cholesterol-lowering drugs

12 Behavioral Intent Last step in the theory before the actual behavior Intent includes o Time frame for performance o The action composing the behavior o Desired outcome (target) o The context of behavior

13 Behavioral Intent Specifics of Health Behavior for George ActionTargetContextTime GetPrescription for Lipitor Internist OfficeNext 2 months UseFresh VegetablesIn meals cooked at home Always TakeLipitorUnspecifiedDaily OrderA saladEating outAlways Example: George intends to always (time) order (action) a salad (target) when eating out at a restaurant (context).

14 Example – Prehypertension I go to the doctor, and I am diagnosed with prehypertension (Systolic of mmHg) Doc suggests I reduce my alcohol consumption. What is the first construct in TRA? Create a belief about reducing alcohol o Difficult to not be in a situation with alcohol o Rate low, -2 I have a negative attitude about reducing my alcohol consumption

15 Example - Prehypertension Construct 2? Create normative believes and “weigh” them by my motivation to comply with the referent source. o My sorority sisters would NOT want me to reduce my alcohol consumption (+5) o My doctor would want me to reduce my ETOH (+3) Arrive at Subjective Norm Next Step?

16 Example - Prehypertension Behavioral Intention o Time frame o Action o Target o Context ActionTargetContextTime DrinkAlcoholAt SchoolGraduate UseLow sodium foods In meals cooked at home Always

17 Smoking – TRA Quiz 1.Your cousin Norm does not think you should quit (+3). 1.Subjective Norm 2. Quitting smoking will save you money. You are a college student with loans. 1.Beliefs about the behavior and evaluations of that behavior 1. Your cousin Norm has smoked his entire life and has no health problems. Norm is your best friend, and you trust him. 1.Normative belief and motivation to comply 2.Quitting smoking will help you save money to pay your college loans (+3) 1.Attitude about belief I

18 TRA and TTI

19 Summary

20 References DiClimente, R., & Salazar, L. (2013). Health Behavior Theory for Public Health: Principles, foundations, and applications. Burlington, MA: Jones and Barlett Learning. Preventing High Blood Pressure: Healthy Living Habits. (2014, July 7). Retrieved October 8, 2014.


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