Transtheoretical Model (TTM / Stages of Change)

Transtheoretical Model (TTM / Stages of Change)

Purpose

Apply the Transtheoretical Model to design interventions calibrated to where a person currently sits in the change cycle. Most behavior-change failures come from applying action-stage tactics (sign up · convert · do it) to precontemplation-stage subjects (didn't know they had the problem yet) — TTM forces the intervention to match the stage. Complements Fogg Behavior Model + COM-B by adding temporal sequencing.

Frameworks & Standards

The Five Stages

1. Precontemplation — not aware of problem · no intention to change in next 6 months · resistant to information
2. Contemplation — aware of problem · weighing pros and cons · ambivalent · intention to change within 6 months
3. Preparation — decided to change · planning small steps · intention to act within 30 days
4. Action — actively modifying behavior · 0–6 months of new behavior
5. Maintenance — sustaining new behavior · 6+ months · vulnerable to relapse
6. (Termination) — habit fully internalized · no relapse risk · often considered the asymptotic 6th stage

Prompt Template

You are applying the Transtheoretical Model (TTM / Stages of Change).

CONTEXT:
- Behavior under consideration: [[behavior_description]]
- Target population: [[population]]
- Current intervention design (if any): [[intervention]]

STAGE DIAGNOSIS:
1. Estimate the dominant stage of the population (precontemplation / contemplation / preparation / action / maintenance)
2. Identify the stage-distribution split (typical: 40% precontemplation / 40% contemplation / 20% preparation+action)
3. Diagnose which stage the current intervention is calibrated for
4. Flag the mismatch (if any) between intervention design and population stage

STAGE-MATCHED INTERVENTION:
- Precontemplation:  Consciousness-raising · dramatic relief · environmental reevaluation
- Contemplation:     Self-reevaluation · weighing pros/cons (decisional balance) · self-liberation
- Preparation:       Helping relationships · self-efficacy reinforcement · commitment devices
- Action:            Reinforcement management · counterconditioning · stimulus control
- Maintenance:       Relapse prevention · social support · environmental supports

OUTPUT:
- Stage diagnosis with confidence band
- Intervention-stage mismatch (if present)
- Stage-matched intervention recommendations (per the 10 processes of change)
- Decisional balance worksheet for contemplators

Core Principles

• Stage-matched intervention beats universal intervention. A "just sign up" CTA to precontemplators is ~10x less effective than consciousness-raising for the same population.
• The 10 processes of change map to stages. Cognitive/affective processes dominate early stages; behavioral processes dominate later.
• Movement is non-linear. Relapse is part of the cycle, not failure. Maintenance-stage subjects can cycle back to contemplation; design for re-entry.
• Decisional balance (pros vs cons of change) shifts predictably across stages — interventions can directly influence it.
• Self-efficacy rises through the stages; tracking it is a leading indicator of stage transition.

Applications & Use Cases

Reference Materials

• Prochaska, J. & DiClemente, C. (1992). "Stages of Change in the Modification of Problem Behaviors." Progress in Behavior Modification 28: 183–218.
• Norcross, J., Krebs, P., & Prochaska, J. (2011). "Stages of Change." Journal of Clinical Psychology 67(2): 143–154.
• University of Rhode Island Cancer Prevention Research Center — https://web.uri.edu/cprc/transtheoretical-model/

Usage Guidelines

• Diagnose stage BEFORE designing intervention. Skipping diagnosis defaults the intervention to action-stage assumptions.
• Survey instruments: URICA (University of Rhode Island Change Assessment Scale) for clinical contexts; behavioral signals (engagement events) for product contexts.
• Track stage transitions, not just outcomes — stage transition is a leading indicator of long-term behavior change.

Collaboration Protocol

• Inbound from: behavioral-designer · conversion-optimizer · nudge-architect · habit-formation-coach
• Outbound to: same agents for stage-matched intervention implementation
• Cross-framework: pairs with Fogg Behavior Model (Motivation × Ability × Prompt fits stage-specific) and COM-B (Capability gaps differ by stage)

Ethical Guidelines

• Stage diagnosis must be based on observable signals + self-report, not assumption
• Manipulating subjects from precontemplation directly to action via dark patterns is unethical regardless of behavioral outcome
• Maintenance-stage relapse must not be framed as user failure; the model explicitly normalizes relapse as part of the cycle

Success Metrics

• Stage-transition rate (% of population advancing one stage per period)
• Stage-appropriate engagement (e.g., contemplators reading decisional-balance content)
• Long-term outcome metrics — TTM's value shows over 12+ months, not 12 days

Related Skills

• composable-skills/frameworks/fogg-behavior-model/SKILL.md — moment-of-action overlay on TTM stages
• composable-skills/frameworks/com-b-model/SKILL.md — Capability + Opportunity gaps by stage
• composable-skills/frameworks/east-framework/SKILL.md — make stage-appropriate intervention Easy + Attractive + Social + Timely
• composable-skills/frameworks/self-determination-theory/SKILL.md — intrinsic motivation rises through TTM stages

Testing Strategy

• A/B test stage-matched vs universal intervention with a population sample diagnosed via URICA or behavioral proxy
• Expected effect size: 15–30% lift in stage-transition rate when intervention matches stage vs random assignment

Copyright (c) 2026 iSystematic Inc. Maxim product. BSL 1.1. Shipped in WS6a of v1.2.0 sprint (2026-05-19). One of 4 HIGH-priority behavioral frameworks per FRAMEWORK_ROADMAP § v1.2.E.