3.4 Selecting Theory and Matching Constructs
Key Takeaways
- Theory selection should follow the determinant revealed by assessment data, not familiarity.
- Key constructs include self-efficacy, perceived barriers, cues to action, norms, reinforcement, and stage of change.
- The Social Ecological Model reminds planners to address levels beyond the individual.
- Even a theory-based plan still needs local adaptation, resources, and evaluation.
Matching the reason for behavior with the design of the intervention
Health behavior theory forces the planner to explain the pathway from a problem to a change strategy. A theory is not chosen because it is familiar or popular; it is chosen because its constructs match the determinants found in assessment. On CHES items, the theory clue is usually embedded in the stem: confidence, perceived risk, barriers, norms, readiness, reinforcement, role modeling, access, or policy support.
The high-yield individual and interpersonal theories
The Health Belief Model (HBM) fits stems emphasizing perceived susceptibility, perceived severity, perceived benefits, perceived barriers, cues to action, and self-efficacy. If adults skip flu vaccines because they feel they are not at risk and fear side effects, the planner targets susceptibility, benefits, and barriers — with a trusted clinician message, myth correction, reminder cues, and easy access.
Social Cognitive Theory (SCT) applies when the stem describes reciprocal determinism among personal factors, behavior, and environment. Its constructs include observational learning, reinforcement, outcome expectations, behavioral capability, and self-efficacy. When teens must practice refusal skills and watch peers model them, SCT beats a one-way lecture.
The Transtheoretical Model (TTM), the stages-of-change model, covers precontemplation, contemplation, preparation, action, and maintenance. Use it when participants differ in readiness and need stage-matched support: a sedentary person in precontemplation needs consciousness raising; a regular walker in maintenance needs relapse prevention and social support.
The Theory of Planned Behavior (TPB) emphasizes attitudes, subjective norms, perceived behavioral control, and intention. It fits behavior shaped by what people believe others expect and whether they feel able to act — for example, a campus sexual-health program addressing perceived peer approval, confidence discussing testing, and intention to schedule it.
Diffusion and the ecological lens
Diffusion of Innovations guides adoption of a new practice, policy, or technology across a group. Its constructs are relative advantage, compatibility, complexity, trialability, observability, and adopter categories (innovators, early adopters, early/late majority, laggards). A hospital rolling out a new referral workflow plans pilot testing, visible early wins, champion users, and simplified steps.
The Social Ecological Model (SEM) is a planning lens, not a single behavior-change recipe. It pushes the CHES to consider individual, interpersonal, organizational, community, and policy levels. If low physical activity stems from unsafe sidewalks, inflexible work hours, caregiving demands, and limited knowledge, a multilevel plan beats an individual lesson.
Theory never replaces cultural humility or stakeholder input. A construct may be valid, but its expression varies by community: perceived barriers may include cost, immigration concerns, stigma, disability access, past discrimination, language, or clinic hours. Involve people who understand those conditions to confirm strategies are respectful and realistic.
A three-step decision rule
For exam purposes, do not overcomplicate the choice. (1) Identify the determinant in the stem. (2) Name the construct that labels it. (3) Pick the strategy that modifies that construct. Low confidence → skills practice, feedback, mastery experiences. Social norms → peer influence or credible norm correction. Policy/access → organizational or environmental change, not more education.
| Stem clue | Likely construct or lens | Strategy direction |
|---|---|---|
| "I do not think I am at risk" | Perceived susceptibility (HBM) | Risk communication with relevance |
| "I cannot do this correctly" | Self-efficacy (SCT) | Practice, feedback, modeling |
| "My friends would disapprove" | Subjective norms (TPB) | Peer norms and supportive messages |
| "The clinic process is too hard" | Perceived barrier (HBM) | Navigation or workflow redesign |
| "Sites adopt at different rates" | Diffusion of Innovations | Champions, trialability, visibility |
| "Sidewalks, work hours, and policy" | Social Ecological Model | Multilevel intervention |
Classic trap: the stem describes an environmental or policy determinant, and the tempting answer is an individual education activity. The keyed answer matches the level of the determinant, not the planner's comfort zone.
Distinguishing theories that look similar
The exam often offers two plausible theories, so know the discriminators. Health Belief Model and Theory of Planned Behavior both involve beliefs, but HBM centers on threat perception (susceptibility and severity) plus benefits and barriers, while TPB centers on attitudes, subjective norms, and perceived behavioral control that form an intention. If the stem stresses what others think of the behavior, lean TPB; if it stresses whether the person feels personally at risk, lean HBM.
Social Cognitive Theory and the Social Ecological Model both mention environment, but SCT is a behavior-change theory built on modeling, reinforcement, and self-efficacy at the individual-and-interpersonal level, whereas SEM is a multilevel organizing lens that says intervene across individual, interpersonal, organizational, community, and policy levels. If the stem lists determinants spanning several levels (sidewalks plus work hours plus policy), choose SEM; if it describes learning a behavior by watching and practicing, choose SCT.
Constructs to recognize on sight
- Self-efficacy: confidence in one's ability to perform the behavior (appears in HBM, SCT, and TPB-style control).
- Cues to action: triggers like reminders, symptoms, or media that prompt action (HBM).
- Outcome expectations: beliefs about what the behavior will produce (SCT).
- Reciprocal determinism: person, behavior, and environment influence each other (SCT).
- Decisional balance and processes of change: weighing pros and cons and the techniques people use to move stages (TTM).
- Relative advantage, trialability, observability: features that speed adoption of an innovation (Diffusion).
Tying theory to strategy on the exam
The final step is converting the construct into an activity. Low self-efficacy calls for guided mastery — small, successful practice with feedback — not a lecture. Strong but negative subjective norms call for credible norm correction or peer messengers. A perceived barrier of cost or hours calls for structural fixes like vouchers, extended hours, or navigation. A precontemplative audience calls for consciousness raising and personal relevance, not relapse-prevention content meant for people already acting.
When two answers both name a real strategy, pick the one whose mechanism matches the construct the stem actually describes.
Assessment shows that adults skip blood pressure checks because they do not believe hypertension can affect them. Which construct is most directly involved?
A school program uses peer modeling, guided practice, and feedback to build refusal skills. Which theory is most clearly reflected?
A CHES professional plans different messages for employees who are not considering exercise, those preparing to start, and those already active. Which model fits best?