The stages of change model is a framework that describes behavior change as a process unfolding through six distinct phases, from having no awareness of a problem all the way to permanently adopting a new behavior. Developed by psychologists James Prochaska and Wayne Velicer, it grew out of research on smoking cessation and has since been applied to everything from weight loss to substance use recovery. The core idea is simple: people don’t flip a switch from unhealthy to healthy. They move through predictable psychological shifts, and understanding where you are in that process can help you (or someone helping you) choose the right approach.
The Six Stages
Precontemplation
In this first stage, a person has no intention of changing within the next six months, typically because they don’t believe there’s a problem. Someone here might say, “I don’t see a problem with what I’m doing, so there’s no reason to change anything.” They may be fully aware that others see an issue, but they tend to focus on the downsides of changing rather than the benefits. The cons of change outweigh the pros in their mind. From the outside, this often looks like denial or defensiveness.
Contemplation
Contemplation is where awareness kicks in. The person acknowledges that a problem exists and is seriously thinking about doing something about it, but they haven’t committed to a plan. This stage is defined by ambivalence: they see both sides and can’t quite tip the scales. A typical thought sounds like, “I know I have a problem, and I think I should do something about it.” This internal tug-of-war can last six months or longer, which is why researchers sometimes call it “chronic contemplation” or behavioral procrastination. People at this stage are generally open to information and receptive to conversations about solutions, even if they aren’t ready to act.
Preparation
In the preparation stage, someone begins taking small, concrete steps toward change. They might research options, set a quit date, sign up for a gym membership, or talk to friends about their plan. The goal of this phase is to leave it with a clear change plan: what they’re going to do, when they’re going to start, and what support they’ll have. Identifying potential barriers ahead of time, like social pressure or lack of accountability, is a key part of preparation. Without that planning, the jump to action tends to be short-lived.
Action
Action is the stage most people picture when they think of behavior change. The person is actively modifying their habits, their environment, or both. For a smoker, this might mean replacing cigarettes with exercise, learning how to decline a colleague’s offer to smoke, or adjusting sleep routines that were tied to old patterns. The work here involves four main tasks: breaking free of the old behavior, staying committed to the new pattern, managing internal and external obstacles like cravings or unsupportive social circles, and revising the plan when something isn’t working. This stage requires the most energy and vigilance.
Maintenance
Once new behaviors have been sustained long enough to become more stable, a person enters maintenance. The risk of slipping back still exists, but confidence grows and the effort required to stick with the change gradually decreases. Maintenance is not a passive stage. It involves actively consolidating gains, reinforcing new habits, and staying alert to situations that could trigger a return to old patterns.
Termination
The final stage, termination, describes a point where the old behavior no longer poses any temptation. The change is fully integrated into the person’s identity and lifestyle. Not everyone reaches this stage, and many behavior change programs focus primarily on moving people into stable maintenance rather than targeting termination as a realistic goal.
Why It’s a Cycle, Not a Straight Line
One of the most important features of this model is that it treats setbacks as a normal part of the process rather than a sign of failure. People rarely move neatly from precontemplation to termination in a single pass. Someone in the action stage might slip back to contemplation after a stressful life event, then cycle forward again with new insight. The model was designed with this reality in mind: relapse is built into the framework as a learning opportunity, not an endpoint. Each time a person moves through the cycle, they typically carry forward lessons that make the next attempt more informed.
What Drives Movement Between Stages
Two psychological forces play a central role in how people progress through the stages: the way they weigh pros and cons (called decisional balance), and their confidence in their ability to sustain change (self-efficacy).
In precontemplation, the perceived downsides of changing far outweigh the benefits. As someone moves toward action, that balance shifts. A meta-analysis of dietary behavior change found that the average increase in perceived pros from precontemplation to action was significantly larger than the average decrease in perceived cons. In other words, what changes most isn’t that the downsides shrink. It’s that the benefits become much more visible and compelling.
Self-efficacy follows a parallel trajectory. It starts low in the early stages, when a person feels little control over the behavior, and rises as they gain experience with successful change. In the early stages, situational temptation, the pull to fall back into old habits in high-risk moments, tends to be high. As self-efficacy builds, temptation decreases. These two forces essentially trade places over the course of the model.
How It’s Used in Practice
The practical value of the model is that it helps match strategies to where a person actually is, rather than applying a one-size-fits-all approach. For someone in precontemplation, the focus is on raising awareness. This might involve helping them visualize the physical consequences of their behavior, like imagining what smoking does to lung tissue, or exploring how their habits affect the people around them through role-playing exercises.
For someone in the action stage, the approach shifts entirely. The emphasis moves to building new routines (exercise, adjusted sleep schedules), learning specific skills to resist social pressure, and setting up a reward system for meeting milestones. Pushing someone in precontemplation to set a quit date would likely backfire, just as gently raising awareness with someone already in action would feel patronizing and irrelevant.
The model has been applied across a wide range of behaviors: smoking cessation, alcohol and drug recovery, physical activity, diet, medication adherence, and even sunscreen use. Its broadest impact has been in addiction treatment and health promotion programs, where it often serves as the backbone for counseling approaches like motivational interviewing.
Criticisms and Limitations
Despite its widespread use, the stages of change model has drawn significant criticism from behavioral scientists. The central debate is whether people actually pass through distinct stages or whether motivation exists on a continuous spectrum. Some researchers argue that the stages are artificial markers on a motivational continuum rather than genuinely separate psychological states. The boundaries between contemplation and preparation, for instance, can feel blurry in practice.
Much of the research supporting the model has been cross-sectional, meaning it captures snapshots of people at different stages rather than following the same individuals over time. Studies have consistently found that variables like self-efficacy and decisional balance differ across stages, but that doesn’t prove the stages themselves are real categories. It shows correlation, not causation.
The evidence for real-world effectiveness is also mixed. A Cochrane review of the model’s use in weight loss interventions found inconclusive results: the difference between stage-matched programs and control groups ranged from just 0.2 to 2.1 kilograms at 24 months, based on low-quality evidence. This doesn’t mean the model is useless, but it does suggest that knowing someone’s stage of change alone may not be enough to produce meaningful outcomes without other strong intervention components.
These critiques haven’t retired the model, but they’ve shifted how experts use it. It’s increasingly treated as a useful clinical lens for understanding readiness to change rather than a rigid, scientifically precise staging system.