PSYC205 Behaviour Change Models in Health Psychology Exam Notes (UKZN): Health Psychology Study Guide

Behaviour change models explain why people start, maintain, and stop health-related behaviours such as smoking, exercise, diet, medication adherence, and safer sex. In Health Psychology, these models are used to understand how beliefs, intentions, social influences, emotions, habits, and environments shape action, and how interventions can be designed to improve wellbeing. This study guide brings together the major theories and exam themes most commonly assessed in PSYC205-style university health psychology modules, with emphasis on practical application, comparison, and evaluation.

1. Core ideas in behaviour change and health psychology

Behaviour change is one of the central concerns of health psychology because many of the leading causes of morbidity and mortality are linked to everyday choices and routines rather than to one single medical event. Diet, physical inactivity, tobacco use, alcohol use, stress management, sleep patterns, sexual behaviour, and adherence to treatment all have behavioural components. The challenge is that knowing what is “healthy” rarely translates automatically into doing it consistently. This gap between knowledge and action is exactly what behaviour change models try to explain.

At the broadest level, behaviour change models answer three questions:

Why do people engage in unhealthy behaviour even when they know the risks?
What makes a person ready to change at a particular time?
What helps a new behaviour become stable over time?

Health psychology does not treat behaviour as random. Instead, it examines the interplay of cognitive factors such as beliefs and intentions, emotional factors such as fear, anxiety, guilt, or hope, social factors such as norms and family influence, and environmental factors such as access, time, money, and transport. A student who wants to exercise may have strong motivation but still fail to act because of unsafe neighbourhoods, heavy workloads, caregiving responsibilities, or lack of affordable facilities. A patient may intend to take medication but forget doses because of daily routines, side effects, stigma, or low understanding of the treatment schedule.

Why models matter in PSYC205

Behaviour change models are not just abstract theories. They matter because they help psychologists and health professionals to:

identify barriers to change,
design interventions that are more realistic,
predict who is likely to act,
tailor messages to different stages or beliefs,
evaluate whether an intervention worked and why.

A common examination theme in PSYC205 is the distinction between describing behaviour and changing behaviour. Some models explain behaviour well but are weak in intervention design. Others provide practical tools but simplify human behaviour too much. Good exam answers show awareness that no single model explains everything. Instead, models are used selectively depending on the behaviour, population, and context.

Health behaviour versus health outcome

It is also important to distinguish between behaviour and health outcome. Behaviour is the action itself: smoking, walking, condom use, clinic attendance, or eating fruit and vegetables. Health outcome is the result: reduced blood pressure, fewer infections, better fitness, improved glucose control, or lower cancer risk. A model may predict intention to exercise, but the outcome may depend on factors beyond intention, such as injury, weather, work schedule, or illness. This matters because many interventions fail when they measure only intention or short-term change and do not track sustained behaviour or long-term health outcomes.

Determinants of behaviour change

A useful way to remember the determinants of health behaviour is to group them into four levels:

Level	Examples	Influence on behaviour
Individual	beliefs, knowledge, self-efficacy, habits, mood	shapes intention, confidence, and action
Interpersonal	family, peers, partners, healthcare workers	creates support, pressure, or modelling
Community	schools, workplaces, clinics, neighbourhoods	affects access and normal behaviour patterns
Structural	poverty, transport, policy, advertising, food availability	can enable or block change regardless of motivation

This table is especially useful in exam essays because it reminds you that individual choice is only one part of behaviour change. In South African contexts, structural factors are often especially important. For example, regular exercise may be difficult where people have limited safe public spaces, inconsistent public transport, or competing responsibilities in households and employment. Similarly, adherence to treatment can be shaped by long clinic queues, stock shortages, stigma, or costs of travel.

Key assumptions across behaviour change models

Although different theories use different terminology, several assumptions recur:

People are not passive; they interpret health information and make decisions.
Beliefs matter, but beliefs do not always produce action.
Behaviour is influenced by both rational and non-rational processes.
Past behaviour matters, because habits and routines are powerful.
Context matters, because people act within social and material environments.
Change is often gradual, not instant.

In exam language, a strong response often states that behaviour change models are valuable because they move beyond simple “information deficit” explanations. People do not necessarily behave unhealthily because they lack knowledge. They may know the risks and still feel ambivalent, low in confidence, socially constrained, emotionally overwhelmed, or trapped in routines. That is why effective health psychology considers both motivation and ability, both intention and opportunity.

Common behaviour change targets in health psychology

The following behaviours are frequently discussed in PSYC205-style modules:

smoking cessation,
alcohol reduction,
weight management,
physical activity,
healthy eating,
medication adherence,
cancer screening attendance,
HIV prevention behaviours,
stress reduction,
sleep improvement.

Each behaviour has its own pattern of determinants. For example, smoking often involves dependence, cue-triggered habits, identity, and social belonging. Physical activity is often affected by self-efficacy, time, fatigue, and environmental access. Medication adherence depends strongly on memory, understanding, side effects, trust, and regimen complexity. This is why the best model depends on the behaviour being studied.

2. Major individual-level models of behaviour change

Individual-level models focus on the person’s beliefs, intentions, self-confidence, and decision processes. These models are common in health psychology because they offer clear constructs and can be tested empirically. They are also frequent exam content because students are expected to compare their strengths and weaknesses. The most important individual-level models include the Health Belief Model, the Theory of Reasoned Action, the Theory of Planned Behaviour, and the Transtheoretical Model. Each offers a different explanation for why a person changes or fails to change.

Health Belief Model

The Health Belief Model (HBM) proposes that people are more likely to take a health action if they believe:

they are susceptible to a condition,
the condition is serious,
the behaviour will provide benefits,
the barriers are manageable,
they receive a cue to action,
they feel self-efficacious enough to act.

The model is useful because it explains why awareness campaigns may fail. A person can know that hypertension is dangerous but still not take action if they believe the risk is distant, the condition is “not that serious,” the treatment is inconvenient, or the benefits feel abstract. The HBM is often applied to screening, vaccination, and preventive behaviours where perceived risk plays a major role.

Key components of the HBM

Perceived susceptibility: belief about the likelihood of getting a disease.
Perceived severity: belief about the seriousness of the disease and its consequences.
Perceived benefits: belief that the action will reduce risk or severity.
Perceived barriers: belief about the costs, inconvenience, pain, shame, or effort involved.
Cues to action: triggers such as symptoms, media messages, family advice, reminders, or clinic visits.
Self-efficacy: belief that one can successfully perform the behaviour.

Example

A woman who has not gone for cervical cancer screening may not act because she feels healthy, fears embarrassment, worries about pain, or does not know where to go. If she receives a direct invitation from a clinic, hears a friend’s positive experience, and understands that screening can detect disease early, her perceived benefits may increase and barriers may feel lower. In this sense, the HBM is very useful for planning messages that raise risk awareness while also reducing practical and emotional resistance.

Strengths and limitations

Strengths:

easy to understand and apply,
useful for preventive behaviours,
highlights risk perceptions and barriers,
useful in designing health communication.

Limitations:

underplays habit and emotion,
assumes behaviour is mostly rational,
weak at explaining repeated actions and addiction,
does not fully account for social and environmental constraints.

A common critique in exams is that people do not always act like rational decision-makers. Fear, habit, cultural meaning, and structural barriers can outweigh beliefs. Someone may believe a behaviour is beneficial and still not do it because of dependence or daily routine.

Theory of Reasoned Action

The Theory of Reasoned Action (TRA) suggests that the best predictor of behaviour is behavioural intention, and intention is shaped by two things:

attitude toward the behaviour,
subjective norm.

Attitude refers to whether a person evaluates the behaviour positively or negatively. Subjective norm refers to perceived social pressure from important others.

The logic is simple: if I think exercising is good and I believe that people who matter to me support it, I am more likely to intend to exercise and then do so. TRA is especially strong when behaviour is largely under voluntary control. It works best for actions where people can decide and act without major external obstacles.

Why the model matters

TRA shifted health psychology toward understanding not just beliefs about risk, but beliefs about the behaviour itself. A person may strongly believe that condom use is effective, yet still not intend to use condoms if they think peers will disapprove or if the behaviour conflicts with relationship expectations. The model therefore shows that social approval can be as important as personal evaluation.

Weaknesses

TRA assumes full volitional control. That is a major limitation in health behaviour. Many behaviours are not fully under control because of addiction, habit, poverty, access, or emotions. TRA also does not directly include past behaviour or self-efficacy. For this reason, it was expanded into the Theory of Planned Behaviour.

Theory of Planned Behaviour

The Theory of Planned Behaviour (TPB) adds perceived behavioural control to the Theory of Reasoned Action. It proposes that behaviour is predicted by intention and perceived control, and that intention is shaped by:

attitude,
subjective norm,
perceived behavioural control.

Perceived behavioural control is the person’s belief about how easy or difficult it is to perform the behaviour. This matters because a person may want to change and approve of the behaviour but still lack confidence, time, money, skills, or access.

Why TPB is powerful

TPB is one of the most widely used models in health psychology because it handles both motivation and control. It can be used for exercise, diet, condom use, screening attendance, and medication adherence. It is especially helpful where behaviour is partly voluntary but still constrained.

Example

A university student may have a positive attitude toward eating healthier food and may know that friends approve of it, but if the campus food environment is expensive and unhealthy, perceived control is low. As a result, intention may weaken or fail to translate into behaviour. This example shows why intention alone is not enough.

Common critique

TPB assumes a fairly linear chain: beliefs → intention → behaviour. Real behaviour is often less orderly. People may act first and justify later, or form habits that no longer require deliberation. TPB also underestimates emotion and identity. Someone may intend to stop smoking but continue because smoking is tied to stress relief or social identity, not only to reasoned evaluation.

Transtheoretical Model

The Transtheoretical Model (TTM), also called the Stages of Change model, argues that behaviour change occurs in stages rather than all at once. The classic stages are:

Precontemplation – not considering change.
Contemplation – thinking about change.
Preparation – intending to act soon.
Action – actively changing behaviour.
Maintenance – sustaining change over time.
Relapse or recycling – returning to earlier stages after a setback.

The model is widely used because it captures change as a process. It is particularly useful for behaviours that are hard to stop, such as smoking, overeating, or alcohol misuse.

Processes of change

The TTM also identifies processes that help movement between stages, such as:

consciousness raising,
self-reevaluation,
environmental reevaluation,
self-liberation,
helping relationships,
counterconditioning,
reinforcement management,
stimulus control,
social liberation,
dramatic relief.

These processes describe what people do to move from awareness to sustained action. For example, someone in contemplation may begin to read about the harms of smoking, while someone in preparation may remove cigarettes from the house and tell family members about the quit attempt.

Strengths and criticisms

The TTM is attractive because it reflects ordinary experience: change often involves setbacks, hesitation, and repeated attempts. However, it is criticised for:

arbitrary stage boundaries,
weak evidence that people move neatly through stages,
overlap between stages,
limited attention to context and social inequality.

Still, it remains highly useful in interventions because it encourages tailoring. A person not ready to change should not receive the same message as a person already taking action.

Comparing the individual-level models

Model	Main predictor	Strength	Limitation
Health Belief Model	risk beliefs and barriers	useful for prevention	weak on habit and emotion
Theory of Reasoned Action	attitude and subjective norm	clear explanation of intention	assumes full control
Theory of Planned Behaviour	intention plus perceived control	stronger than TRA	still too rational
Transtheoretical Model	stage of readiness	useful for tailoring change	stage boundaries are debated

A high-quality exam answer often compares models by asking which one best fits the behaviour. For example, TPB may be better for condom use, where intention and perceived control are central, while HBM may be better for screening uptake, where susceptibility and severity matter more. TTM may be more useful for smoking cessation because it captures relapse and gradual progression.

3. Social-cognitive, self-regulation, and habit-based approaches

While individual-level models are important, health behaviour is not explained by beliefs alone. People also learn from others, regulate their own actions, and follow habits that operate almost automatically. Social-cognitive and self-regulation approaches are essential because they explain how behaviour is performed over time, how confidence develops, and why people may fail even when intentions are strong. These approaches bridge the gap between thinking about change and actually doing it.

Social Cognitive Theory

Social Cognitive Theory (SCT), strongly associated with Albert Bandura, argues that behaviour, personal factors, and the environment influence one another through reciprocal determinism. This means the person is not shaped by environment alone, and environment is not controlled by person alone. Instead, beliefs, actions, and context continually interact.

A core construct is self-efficacy, the belief that one can perform a behaviour successfully in a particular situation. Self-efficacy is one of the most important predictors of change because people are more likely to attempt, persist, and recover from setbacks when they believe they can succeed.

Major SCT concepts

Reciprocal determinism: behaviour, person, and environment influence each other.
Self-efficacy: confidence in ability to perform the behaviour.
Outcome expectations: beliefs about the likely results of behaviour.
Observational learning: learning by watching others.
Reinforcement: rewards or punishments that shape behaviour.
Behavioural capability: knowledge and skills needed to perform the behaviour.

Example

A person trying to begin walking for fitness may be more successful if they see peers walking, receive encouragement, learn safe routes, and track small improvements. These experiences raise self-efficacy. If they miss a week due to rain or work demands, self-efficacy may drop unless the intervention helps them reframe the setback and restart. This is why SCT is often used in community and group-based interventions rather than only in individual counselling.

Why self-efficacy matters so much

Self-efficacy affects:

whether people start,
how much effort they invest,
how persistent they are after failure,
how they interpret setbacks,
whether they see a behaviour as achievable.

People with low self-efficacy often interpret difficulty as proof that change is impossible. People with higher self-efficacy are more likely to view difficulty as a normal part of learning. This difference is highly relevant in health psychology because many behaviours require repeated effort, not a single decision.

Self-regulation

Self-regulation refers to the processes people use to control their own thoughts, feelings, and actions in pursuit of goals. In health behaviour, self-regulation includes goal setting, self-monitoring, planning, feedback, and adjusting strategies when circumstances change. This is especially important because intentions often fail when not translated into concrete action plans.

Key self-regulation strategies

Goal setting
Goals should be specific and realistic. “Exercise more” is weaker than “walk for 30 minutes after class on Monday, Wednesday, and Friday.”
Self-monitoring
Tracking behaviour makes patterns visible. A person who records meals, steps, or cigarettes gains feedback about triggers and progress.
Action planning
Planning when, where, and how to act reduces ambiguity.
Coping planning
Planning for obstacles helps sustain change. For instance, “If I am too tired to go to the gym, I will walk for 15 minutes after dinner.”
Feedback and review
Behaviour changes are more likely when progress is reviewed regularly.
Reward and reinforcement
Small rewards support persistence.

Example

A student with diabetes who wants to improve diet may plan meals, monitor glucose, and note emotional triggers for snacking. If the student only says “I will eat better,” the intention is too vague. If they specify what to buy, when to cook, and what to do when stressed, the chances of success improve. Self-regulation is therefore highly practical and is often used in interventions for weight management, physical activity, and adherence.

Habit and automaticity

Not all health behaviour is fully deliberate. Habit refers to behaviour that becomes automatic through repetition in stable contexts. A person might smoke after meals, check their phone while eating, or take medication at a particular time because the behaviour has become cued by routine rather than conscious decision.

This matters because habits can support positive change or block it. Good habits reduce cognitive load, but bad habits are difficult to break. Someone may genuinely intend to stop eating late at night but continue because the behaviour is tied to stress, routine, or environmental cues such as television watching.

Why habit is often overlooked

Many models assume that people think before acting. In reality, much health behaviour is semi-automatic. This is one reason why interventions that rely only on education may fail. Breaking habit often requires:

changing the environment,
altering cues,
replacing the old behaviour with a new one,
using repetition until the new routine becomes easier.

Implementation intentions

A highly useful concept in behaviour change is the implementation intention, often expressed as an “if-then” plan. For example:

“If it is 7 a.m., then I will go for a walk.”
“If I feel like smoking, then I will drink water and wait ten minutes.”
“If I miss my medication time, then I will set a phone alarm immediately.”

Implementation intentions help because they connect a situational cue with a specific response. They are stronger than general intentions because they reduce the need to decide in the moment. This is especially helpful when people are tired, stressed, or distracted.

Why social-cognitive and self-regulation approaches are important in exams

These approaches are often examined because they add depth beyond intention. A strong answer should explain that:

intention is not enough,
confidence matters,
environment matters,
skills matter,
action plans matter,
relapse is normal.

A student may write that a person wants to exercise, but without self-efficacy, planning, and environmental support, the intention may not become behaviour. The real value of these models is that they show how change can be supported in practical ways rather than treated as a purely mental decision.

4. Motivation, readiness, and maintenance of change

A major issue in behaviour change is that starting a new behaviour is not the same as keeping it going. Many people can be motivated for a short period, but maintenance is often harder because daily life reintroduces stress, boredom, fatigue, competing priorities, and old cues. This section focuses on motivational principles, readiness, relapse, and long-term maintenance.

Motivation is not a fixed trait

Motivation should not be treated as a permanent personality characteristic. It is dynamic and can rise or fall depending on context, mood, feedback, social pressure, and life circumstances. Someone may feel motivated to eat healthily after a clinic visit but lose momentum a week later when money is tight or family routines take over. This variability is important because it means interventions must support motivation over time, not only at the start.

Intrinsic and extrinsic motivation

Motivation can be divided into:

Intrinsic motivation: doing a behaviour because it is personally rewarding or meaningful.
Extrinsic motivation: doing a behaviour because of external rewards, pressure, or consequences.

In health behaviour, intrinsic motivation tends to support longer-term maintenance because the behaviour becomes valued in itself. For example, a person who begins walking only to lose weight may stop once the immediate goal is not achieved, but a person who comes to enjoy walking for stress relief, social time, and energy may maintain it longer.

However, extrinsic motivation also matters. Reminders from health workers, family encouragement, financial incentives, and institutional rules can help start change. The key issue is whether external supports eventually lead to more stable internal commitment.

Readiness to change

Readiness refers to how prepared a person is to act. In many interventions, readiness is more useful than asking whether a person is “motivated” in general. A person may not yet be ready because they do not feel enough concern, do not believe they can succeed, or do not know where to begin.

The Transtheoretical Model links readiness to stages, but readiness can also be understood more flexibly as a spectrum. This matters because people may be ready for one part of change but not another. For instance, they may be ready to reduce smoking but not yet ready to quit completely. Recognising partial readiness allows for smaller, more realistic goals.

Relapse and recycling

Relapse is common and should not be treated as failure in a moral sense. It is often part of the change process. A person trying to stop smoking may relapse during stress, social occasions, or emotional distress. A person improving diet may revert to old habits during exams or family celebrations. In health psychology, relapse is best understood as a learning opportunity rather than proof that change is impossible.

Why relapse happens

Relapse may occur because of:

stress,
negative emotions,
social pressure,
cue exposure,
low coping skills,
overconfidence,
unrealistic goals,
lack of support,
environmental triggers.

What helps after relapse

Effective relapse management involves:

identifying triggers,
reviewing what happened,
avoiding self-blame,
strengthening coping strategies,
adjusting goals,
planning for high-risk situations.

A useful exam point is that maintenance requires different supports from initiation. Starting a behaviour may rely on enthusiasm, but maintenance often needs routine, environmental design, social reinforcement, and coping strategies for setbacks.

The role of goals and feedback

Goal setting is central to maintenance because people need a clear standard for progress. Goals should be:

specific,
measurable,
realistic,
time-bound,
personally meaningful.

Feedback should also be timely. A person trying to lose weight may be discouraged if progress is too slow or invisible. Regular feedback helps connect behaviour with outcomes. However, feedback should be framed carefully because harsh feedback can reduce self-efficacy.

Maintenance strategies in real health settings

In practical interventions, maintenance is supported by:

follow-up appointments,
reminders by SMS or phone,
peer support groups,
family involvement,
written action plans,
coping skills training,
gradual habit building,
environmental restructuring.

For example, an HIV treatment adherence programme may use pill organisers, clinic follow-up, counseling about side effects, and social support from a treatment partner. A physical activity programme may encourage walking groups, safe routes, and self-monitoring apps. These examples show that maintenance is not simply a matter of willpower. It is usually a combination of personal discipline and supportive systems.

Why motivation, readiness, and maintenance matter in evaluation

When evaluating an intervention, it is not enough to ask whether participants changed immediately. The key questions are:

Did the intervention increase readiness?
Did it help people act?
Did it support maintenance?
Did relapse decrease over time?
Were the changes sustained?

A good PSYC205 answer should therefore show awareness that change is temporal. Different models focus on different phases. Some explain whether someone intends to start, while others explain how change is maintained. Examiners often reward students who recognise this process view of behaviour change.

5. Evaluation, comparison, and application in South African health contexts

The final step in mastering behaviour change models is being able to evaluate them critically and apply them to real health problems. In university exams, this often separates descriptive answers from strong analytical ones. The most successful answers do not simply list theories; they compare them, explain where they work, show where they fail, and apply them to context. This section focuses on the strengths, weaknesses, and practical use of behaviour change models in health psychology, with attention to South African realities relevant to UKZN-style study.

General strengths of behaviour change models

Behaviour change models have several major strengths:

They give structure to complex human behaviour.
They identify specific psychological variables for intervention.
They support tailoring rather than one-size-fits-all messaging.
They help practitioners design better health promotion strategies.
They make it possible to test hypotheses scientifically.
They provide a common language for research and practice.

For example, if a clinic wants to improve vaccination uptake, a model can help identify whether the main issue is low perceived susceptibility, fears about side effects, poor social norms, low confidence, or logistical barriers. Without a model, intervention design can become vague and reactive.

General limitations of behaviour change models

Despite their value, the models also have serious limitations:

They may overemphasise rational choice.
They may underplay emotion, habit, and identity.
They often focus on the individual rather than structural inequality.
They may assume people have meaningful freedom to choose.
They can be harder to apply in settings with poverty or poor access.
Different models may explain the same behaviour differently, creating ambiguity.

A major critique in health psychology is that many interventions place too much responsibility on individuals. Telling people to “choose health” is not enough if food is unaffordable, safe exercise spaces are limited, transport is unreliable, or clinics are overstretched. Behaviour change models are most effective when they are integrated with environmental and policy interventions.

Comparing models by type of behaviour

Different behaviours call for different theoretical emphasis.

Behaviour	Model features especially relevant	Why
Smoking cessation	self-efficacy, relapse, habit, cues	nicotine dependence and routine are strong
Physical activity	self-efficacy, planning, environmental support	requires repeated effort and access
Healthy eating	attitudes, habits, barriers, self-regulation	food choice is shaped by environment
Medication adherence	control, cues, routines, support	often depends on memory and practical constraints
Screening attendance	susceptibility, severity, barriers, cues	preventive action depends on risk perception
Safer sex	attitude, norms, perceived control	involves social and relationship factors

This table is useful because it shows that no single model is “best” in all cases. For example, screening behaviours may be strongly influenced by perceived risk and barriers, making the Health Belief Model useful. Exercise behaviours may benefit from Social Cognitive Theory because confidence and environmental support are critical. Safer sex often requires both norms and control, which makes TPB particularly relevant.

Applying models to South African health promotion

In South Africa, behaviour change must be understood in relation to inequality, history, and resource constraints. Health promotion programmes cannot assume the same level of access, safety, or financial stability across populations. In many communities, people face overlapping challenges such as unemployment, food insecurity, long travel distances to clinics, overcrowding, and high stress. These realities affect the feasibility of change.

Example 1: Medication adherence in chronic illness

A patient with hypertension may know that medication lowers risk, but adherence can still be low because of:

forgetfulness,
side effects,
disbelief that the illness is serious,
competing household responsibilities,
irregular clinic stock,
transport costs,
complicated dosing schedules.

In this situation, the HBM helps explain beliefs about severity and barriers, while SCT explains self-efficacy and support, and self-regulation helps with routines and reminders. The best intervention would combine education, practical planning, and system-level support.

Example 2: Physical activity in an urban or peri-urban setting

A student or worker may want to exercise but face unsafe routes, time constraints, or lack of facilities. TPB may show positive attitudes and intentions, but low perceived behavioural control. SCT would add that seeing peers exercise can improve confidence, while environmental changes such as safe walking groups may create real opportunity. Here, behaviour change is not just about desire; it is about access and routine.

Example 3: HIV prevention and safer sex

Safe sex behaviours are shaped by attitudes, perceived norms, relationship dynamics, power, and access to condoms. A person may intend to use condoms but feel unable to insist on them within a relationship. TPB helps show how subjective norms and perceived control matter, while SCT and gender-aware approaches help explain social and relational power. This is a strong example because it shows why individual models may need to be expanded by social context.

What makes an exam answer strong?

A strong PSYC205 answer usually does the following:

Defines the model accurately.
Explains the main constructs clearly.
Shows how the model predicts behaviour.
Applies it to a health behaviour example.
Evaluates strengths and limitations.
Compares it with another model.
Links it to real-world intervention design.

Common exam mistakes

Students often lose marks by doing the following:

mixing up attitude and subjective norm,
describing stages without explaining their meaning,
treating self-efficacy as the same as motivation,
ignoring relapse,
assuming knowledge automatically causes behaviour,
using only one model for a complex behaviour,
forgetting environmental and structural barriers,
providing examples without linking them to theory.

Integrated view of behaviour change

The most sophisticated understanding of health behaviour combines several models rather than relying on one. An integrated view recognises that:

people must value the behaviour,
they must feel social support or at least low resistance,
they must believe they can do it,
they need a plan,
they need cues and reinforcement,
the environment must allow change,
relapse must be anticipated.

This integrated perspective is often the best way to answer essay questions because it shows critical thinking. It avoids the simplistic idea that one model fits all. In practice, health promotion is most effective when it combines:

information,
skills training,
motivational support,
social support,
environmental change,
follow-up and reinforcement.

Final synthesis for revision

If revision time is short, the key ideas to remember are these:

HBM: behaviour depends on perceived risk, benefits, barriers, cues, and self-efficacy.
TRA: intention is shaped by attitude and subjective norm.
TPB: intention is shaped by attitude, subjective norm, and perceived behavioural control.
TTM: change happens through stages and relapse is normal.
SCT: self-efficacy, observational learning, and reciprocal determinism are central.
Self-regulation: action plans, monitoring, coping plans, and feedback sustain change.

A final exam-ready conclusion is that behaviour change models are valuable because they reveal the multiple layers behind health action. They show that health behaviours are not simply chosen; they are shaped by beliefs, confidence, social relationships, habits, and opportunity. The most effective health psychology practice combines theory with context, and combines individual support with realistic attention to the environments in which people live.