83 Behavior Change Techniques Across BCT Taxonomies

Behavior Change Techniques (BCTs) are the building blocks of psychological interventions. They are designed to alter or redirect causal processes that regulate behavior. BCT taxonomies have been developed to categorize these techniques in a systematic way, making it easier for researchers and practitioners to communicate about them and to design effective interventions.

Understanding BCT Taxonomies

BCT taxonomies are comprehensive frameworks that list and define the individual techniques used in the delivery of behavior change interventions. One widely recognized taxonomy details 83 distinct BCTs, providing a shared language for the field. This taxonomy has been pivotal in the evaluation and development of behavior change interventions.

Categories of Behavior Change Techniques

Goal Setting: Establishing objectives to work towards.
Self-Monitoring: Tracking one’s own behavior to gauge progress.
Feedback on Behavior: Providing information on performance.
Social Support: Leveraging relationships to encourage change.
Shaping Knowledge: Educating on how to perform the behavior.

Applying BCTs in Interventions

Behavior change interventions often combine several BCTs to tackle complex behaviors. For example, in a weight loss program, goal setting, self-monitoring, and feedback on behavior are commonly used together to encourage individuals to adopt healthier eating and exercise habits.

Effectiveness of BCTs

Research has shown that interventions using clearly defined BCTs are more effective than those that do not. However, the effectiveness of BCTs can vary depending on the context and the behaviors targeted.

Challenges in Implementing BCTs

Despite the advantages, there are challenges in implementing BCTs. These include ensuring fidelity to the intervention design, training interventionists, and adapting BCTs to different cultural contexts.

Mapping BCTs to the COM-B Model for Strategic Selection

Selecting a handful of techniques from a list of 83 can feel overwhelming without a theoretical compass. The most effective way to choose the right BCTs is by utilizing the COM-B model, which posits that for any behavior to occur, a person must have the Capability, the Opportunity, and the Motivation to perform it. By performing a behavioral analysis first, practitioners can map specific BCTs to the missing components of the COM-B framework rather than applying techniques randomly.

For instance, if a patient has the desire to exercise (Motivation) and the gym is nearby (Opportunity), but they do not know how to use the equipment safely, they lack Psychological Capability. In this scenario, applying “Goal Setting” or “Incentives” would be ineffective because the barrier is a lack of knowledge. Instead, the practitioner should select BCTs from the “Shaping Knowledge” category, such as “Information about health components” or “Instruction on how to perform the behavior.”

Conversely, if a person knows how to eat healthily and wants to do so, but lives in a “food desert” with no access to fresh produce, the barrier is Physical Opportunity. Here, BCTs that focus on internal psychology—like “Self-monitoring”—will yield minimal results. The intervention must instead focus on environmental restructuring or techniques that help the user navigate their specific constraints, such as “Identification of social support” to find carpools to a distant grocery store.

The mapping process typically follows this logical flow: Behavioral Analysis → Identification of COM-B deficits → Selection of corresponding BCTs. This ensures that the intervention is targeted. For example, to address Automatic Motivation (impulses and habits), one might use “Environmental Restructuring” to remove triggers, whereas Reflective Motivation (conscious planning) is better addressed through “Action Planning” or “Pros and Cons Analysis.”

Deep Dive into High-Impact BCTs: Action Planning and Coping Planning

While many of the 83 BCTs are useful, a few “heavy hitters” consistently appear in successful interventions. Two of the most critical, yet often confused, are Action Planning and Coping Planning. While both involve forward-thinking, they serve entirely different psychological functions.

Action Planning is the process of specifying the when, where, and how of a behavior. It bridges the “intention-behavior gap.” A common mistake is allowing a user to set a vague goal, such as “I will walk more next week.” An Action Plan transforms this into: “I will walk for 30 minutes at the local park every Monday, Wednesday, and Friday at 7:00 AM, wearing my blue sneakers.” By defining the spatio-temporal cues, the brain creates a mental trigger that reduces the cognitive load required to initiate the action.

Coping Planning, on the other hand, is a preemptive strategy to handle obstacles. It utilizes “if-then” logic (Implementation Intentions). For example: “If it is raining on Wednesday morning and I cannot go to the park, then I will do a 30-minute yoga video in my living room.” Coping planning is essential for long-term maintenance because it prevents a single failure from triggering a total collapse of the habit (the “what-the-hell effect”).

An edge case occurs when an intervention over-relies on Action Planning without Coping Planning. In high-stress environments, such as a hospital ward or a busy corporate office, the environment is volatile. A rigid Action Plan often fails the moment an emergency arises. In these contexts, Coping Planning becomes the primary driver of success, as it prepares the individual to pivot their behavior without losing momentum.

Integrating BCTs into Digital Health and UX Design

The translation of BCT taxonomies into digital products—such as mobile apps, wearables, and web portals—requires mapping psychological techniques to specific User Experience (UX) features. Digital interventions allow for the delivery of BCTs at scale and in real-time, but they risk becoming “feature-bloated” if not guided by the taxonomy.

For example, Self-Monitoring is frequently implemented via dashboards, step counters, or food logs. However, the BCT is not the log itself, but the act of the user observing their own data to trigger a cognitive shift. To make this effective, UX designers must pair self-monitoring with Feedback on Behavior. A raw number of steps is less effective than a visualization showing the user’s progress relative to their goal, or a notification stating, “You are only 500 steps away from your 5-day streak!”

Social Support can be digitized through community forums, leaderboards, or “buddy systems.” However, a critical edge case in digital BCT application is “social comparison threat.” While a leaderboard can motivate a high-performer (using the BCT of “Competition”), it can demotivate a beginner who sees they are at the bottom of the list. To mitigate this, designers can implement “segmented leaderboards” or “peer-matching,” ensuring the social support remains encouraging rather than discouraging.

Furthermore, Environmental Restructuring in a digital context often takes the form of “default settings.” By changing the default notification settings or simplifying the user interface to remove distractions, designers can nudge users toward the desired behavior without requiring active willpower. This is a powerful application of BCTs because it targets the “Opportunity” component of the COM-B model silently in the background.

Sequencing and Dosing: The Temporal Logic of BCTs

The order in which BCTs are introduced is often as important as the techniques themselves. Applying all 83 BCTs simultaneously would lead to cognitive overload and intervention fatigue. Instead, practitioners should use a sequenced approach, moving from foundational capability to active maintenance.

A typical effective sequence follows a “Ladder of Change”:

Phase 1: Priming and Capability. Start with “Shaping Knowledge” and “Information about health components.” The user must understand why the change is necessary and how to do it before they can be expected to commit.
Phase 2: Commitment and Goal Setting. Once the user is capable, introduce “Goal Setting (Behavior)” and “Pros and Cons Analysis.” This moves the user from passive knowledge to active intention.
Phase 3: Implementation. Deploy “Action Planning” and “Coping Planning.” This is where the intention is converted into a concrete schedule.
Phase 4: Monitoring and Reinforcement. Introduce “Self-monitoring,” “Feedback on Behavior,” and “Reward/Incentives.” These techniques sustain the behavior and prevent relapse.

The concept of “dosing” refers to the frequency and intensity of the BCT application. For instance, “Feedback on Behavior” has a diminishing return; if a user receives a notification every hour, they will eventually ignore it (habituation). The optimal dose often involves “intermittent reinforcement,” where feedback is provided unpredictably or only upon reaching significant milestones, which keeps the dopamine response active and the user engaged.

Managing Resistance and Psychological Reactance

Not all BCTs work for all people. In some cases, the application of a BCT can trigger psychological reactance—a motivational state that occurs when people feel their freedom of choice is being threatened. This is common when “Goal Setting” or “Instruction” is delivered in a prescriptive or paternalistic tone.

For example, if a healthcare provider tells a patient, “You must lose 10 pounds by next month,” the patient may perceive this as a demand rather than a goal. This can lead to “counter-arguing” or a total rejection of the intervention. To avoid this, the BCT of “Goal Setting” should be transitioned into “Collaborative Goal Setting,” where the user defines the target. This shifts the locus of control from the provider to the individual, turning a perceived demand into a personal commitment.

Another challenge is “intervention fatigue,” where the user becomes exhausted by the effort of self-monitoring and planning. When this occurs, the practitioner should shift from high-effort BCTs (like detailed logging) to low-effort BCTs (like environmental restructuring). For example, instead of asking a user to log every calorie they eat (high effort), the intervention might suggest they use smaller plates to naturally reduce portion sizes (low effort). This allows the user to maintain progress while their cognitive resources recover.

Evaluating Fidelity and BCT Coding in Research

To determine if a behavior change intervention actually works, researchers must distinguish between the intervention as a whole and the specific BCTs within it. This is achieved through BCT Coding. Coding is the process of independently analyzing the intervention materials (scripts, app screens, manuals) and tagging every instance of a BCT from the taxonomy.

Fidelity refers to how closely the delivered intervention matches the planned BCT profile. A common failure in clinical trials is “drift,” where the interventionist stops using certain BCTs over time. For example, a therapist might start by using “Coping Planning” in every session but eventually stop doing so because the patient seems to be doing well. If the study then finds that the intervention was effective, it is unclear whether the success was due to the Coping Planning or some other factor, because the fidelity to the BCT profile was lost.

To ensure rigorous evaluation, researchers often use “double-coding,” where two independent experts code the intervention and calculate an inter-rater reliability score (such as Cohen’s Kappa). If the coders disagree on whether a specific interaction constitutes “Social Support” versus “Feedback,” the definitions must be refined. This level of precision allows researchers to perform “meta-analyses” to see which specific BCTs—across hundreds of different studies—are most effective for specific behaviors, such as smoking cessation or medication adherence.

FAQ on Behavior Change Techniques

What is a BCT taxonomy?

A BCT taxonomy is a structured classification system that organizes behavior change techniques into distinct categories for ease of use and study in psychological interventions.

How many BCTs are there in the recognized taxonomy?

The widely recognized taxonomy details 83 distinct BCTs, each with its own definition and application guidelines.

Can BCTs be used for any type of behavior change?

Yes, BCTs can be adapted and applied to a wide range of behaviors. However, the choice of techniques should be based on the specific behavior and context.

Are BCTs more effective when used in combination?

Combining BCTs can be more effective as it allows for a multifaceted approach to changing complex behaviors.

What are the challenges of using BCTs?

Challenges include ensuring that the interventions are delivered as designed, training facilitators appropriately, and adapting techniques to suit different cultural contexts.