Processes of Change Questionnaire- Drug Version

1. Abstract

The Processes of Change Questionnaire- Drug Version (POC-D) is a multidimensional psychometric instrument designed to assess the covert and overt cognitive, affective, and behavioral activities that individuals engage in when attempting to modify, reduce, or cease illicit drug use. Grounded in the Transtheoretical Model (TTM) of behavior change pioneered by James O. Prochaska and Carlo C. DiClemente, the instrument measures the essential kinetic engines of intentional change. Available in both a full 40-item version and an abbreviated 20-item version, the POC-D evaluates ten distinct processes of change, which hierarchically organize into two higher-order domains: Experiential (Cognitive-Affective) Processes (Consciousness Raising, Dramatic Relief, Environmental Re-evaluation, Self-Re-evaluation, and Social Liberation) and Behavioral Processes (Contingency Management, Counter Conditioning, Helping Relationships, Self-Liberation, and Stimulus Control). Respondents rate the frequency of their engagement in each change strategy using a 5-point Likert scale ranging from 1 (Never) to 5 (Repeatedly).

Psychometric evaluations across diverse substance-using cohorts—including outpatient clinical populations, community samples, and opioid-dependent individuals undergoing maintenance therapies—demonstrate strong internal consistency (subscale Cronbach’s α coefficients typically ranging from .70 to .91) and robust construct validity. Confirmatory factor analyses consistently substantiate the correlated ten-factor first-order structure subsumed under the two second-order experiential and behavioral dimensions. As a diagnostic and clinical monitoring instrument, the POC-D provides actionable behavioral profiles that guide stage-matched interventions, predict longitudinal treatment retention, and optimize relapse prevention protocols across clinical psychology and addiction medicine settings.

2. Keywords

Processes of Change, Transtheoretical Model, Substance Use Disorders, Drug Addiction Assessment, Psychometrics, Experiential Processes, Behavioral Processes, Stage-Matched Interventions, Addiction Medicine, Relapse Prevention

3. Authors

The foundational conceptualization of the Processes of Change within the Transtheoretical Model was established by James O. Prochaska, Ph.D. (Cancer Prevention Research Center, University of Rhode Island) and Carlo C. DiClemente, Ph.D. (Department of Psychology, University of Maryland, Baltimore County [UMBC]). Significant contributions to the operationalization, measurement refinement, and hierarchical structural validation were contributed by Wayne F. Velicer, Ph.D. and Joseph S. Rossi, Ph.D.

The specific cross-validation and psychometric adaptation of the 40-item and 20-item drug-specific variants (POC-D) across clinical populations, including individuals with heroin and polysubstance use disorders, were substantially advanced by international clinical psychometricians, notably Amador Tejero, Ph.D., Joan Trujols, Ph.D., Enriqueta Hernández, José Pérez de los Cobos, M.D., Ph.D., and Miguel Casas, M.D., Ph.D., associated with the Addictive Behaviors Unit, Department of Psychiatry, Hospital de la Santa Creu i Sant Pau and Universitat Autònoma de Barcelona, in close alignment with research protocols disseminated through the HABITS (Health and Addictive Behaviors: Investigating Transtheoretical Solutions) Laboratory at UMBC under the direction of Carlo C. DiClemente.

4. Purpose

The primary clinical and psychometric objective of the Processes of Change Questionnaire- Drug Version is to quantitatively capture how individuals alter their drug-taking behavior, rather than merely assessing when they intend to change or the severity of their physical dependence. Within the broader architecture of clinical assessment in addiction psychology, traditional scales frequently focus on symptom severity, craving intensity, or global diagnostic criteria as outlined in the Diagnostic and Statistical Manual of Mental Disorders. While diagnostic tools provide classification, they frequently fail to capture the dynamic, self-regulatory mechanisms through which recovery actually unfolds. The POC-D directly bridges this operational gap by measuring the coping activities, mental operations, and environmental strategies deployed by individuals navigating the recovery continuum.

Clinically, the POC-D serves several vital functions. First, it facilitates stage-matched intervention planning. According to the Transtheoretical Model, treatment efficacy is compromised when behavioral action strategies (such as stimulus control or contingency management) are prescribed to individuals who have not yet engaged in experiential activities (such as dramatic relief or consciousness raising). By profiling an individual’s operational processes, clinicians can ascertain whether a client is relying appropriately on experiential insights (typical of Contemplation and Preparation stages) or actively shifting toward behavioral modifications (essential for Action and Maintenance stages). This prevents clinical mismatches that frequently lead to premature therapeutic dropouts, client resistance, and early relapse.

In empirical addiction research, the POC-D functions as an essential mediator and predictor variable in clinical trials evaluating Motivational Interviewing, Cognitive Behavioral Therapy (CBT), contingency management systems, and pharmacological therapies. Researchers utilize the instrument to track treatment mechanisms of change, ensuring that therapeutic protocols are actively triggering the specific psychological processes they hypothesize to modify. Furthermore, the availability of both the comprehensive 40-item inventory and the rapid 20-item version permits versatile deployment across extensive intake batteries, ecological momentary assessment (EMA) protocols, and longitudinal repeated-measures outcome studies.

5. Psychological Construct

The psychological construct measured by the POC-D consists of ten intermediate-level coping activities termed the “Processes of Change.” These processes represent systematic, purposeful categories of experiential and behavioral activities that individuals mobilize to modify maladaptive cognitions, affects, behaviors, and environmental contexts associated with problem drug use. The ten processes are divided evenly into two overarching second-order domains.

Experiential (Cognitive-Affective) Processes

Experiential processes are covert, internal mechanisms involving cognitive appraisal, affective processing, and environmental awareness. They are most prominently mobilized during the early, exploratory stages of recovery:

• Consciousness Raising: The process of actively seeking and processing objective information, education, and personal feedback regarding drug use, its pharmacodynamics, psychological consequences, and pathways to cessation (e.g., actively reading articles about drug dependence or seeking educational resources).
• Dramatic Relief: Affective arousal and emotional experiencing provoked by the hazards of drug use, often characterized by cathartic reactions to warnings, personal health risks, or stories of addiction, followed by a relief that change is possible (e.g., experiencing visceral fear or sorrow when considering the physical devastation wrought by drugs).
• Environmental Re-evaluation: Cognitive and emotional appraisal of how one’s illicit drug use affects one’s social, physical, and familial environment, including interpersonal relationships, financial stability of dependents, and broader social obligations (e.g., realizing that one’s substance use directly inflicts psychological distress on loved ones).
• Self-Re-evaluation: The deep cognitive and affective assessment of one’s self-image, values, and core identity with and without drug use. It involves acknowledging the conflict between one’s fundamental life goals and the realities of dependence (e.g., experiencing disappointment in oneself for remaining dependent on a chemical substance, contrasted with the vision of personal competence in recovery).
• Social Liberation: Awareness, recognition, and utilization of expanding social alternatives, public policies, advocacy groups, and societal structures that empower and support drug-free lifestyles (e.g., noticing public anti-drug health campaigns or public policies promoting access to addiction treatment).

Behavioral Processes

Behavioral processes are overt, action-oriented strategies that involve direct manipulation of behavioral responses, reinforcers, and environmental contingencies. They dominate the later stages of sustained behavior change:

• Contingency Management (Reinforcement Management): The systematic application of internal and external rewards, positive reinforcement, and self-recognition for achieving sobriety milestones or resisting drug cravings (e.g., treating oneself to a rewarding activity after successfully overcoming an urge).
• Counter Conditioning: The substitution of healthy, adaptive behaviors, cognitive responses, or relaxation techniques for drug-using rituals when confronted with stress, tension, or conditioned drug cues (e.g., engaging in physical exercise or deep breathing when experiencing a drug craving).
• Helping Relationships: The cultivation, maintenance, and open utilization of trusting, supportive interpersonal relationships with peers, counselors, family members, or mutual-help group members who provide empathetic listening and active support for recovery efforts (e.g., confiding in a sponsor or trusted friend when encountering intense cravings).
• Self-Liberation: The explicit belief in one’s personal capability to change (self-efficacy) coupled with the firm psychological commitment, willpower, and decision to maintain total abstinence or controlled behavior (e.g., making firm, conscious commitments never to engage in illicit drug use).
• Stimulus Control: The strategic restructuring of one’s physical and social environment to eliminate or reduce drug-associated conditioned stimuli (cues) while introducing prompts for healthy behaviors (e.g., discarding drug paraphernalia, moving away from drug-procuring neighborhoods, or avoiding drug-using peers).

6. Theoretical Framework

The conceptual foundation of the POC-D is anchored in the Transtheoretical Model (TTM) of behavior change, formulated by James O. Prochaska and Carlo C. DiClemente in the early 1980s. The TTM was derived from an extensive comparative analysis of major systems of psychotherapy—including psychoanalytic, humanistic, behavioral, gestalt, and cognitive schools—aimed at answering a fundamental question: how do people achieve long-term, self-directed or clinically assisted modifications in deeply ingrained addictive behaviors?

The model is organized along three core dimensions: the Stages of Change (the temporal dimension: Precontemplation, Contemplation, Preparation, Action, Maintenance), the Processes of Change (the kinetic coping activities: experiential and behavioral), and the Decision Balance / Self-Efficacy markers (the psychological mediators of change). The processes of change represent the engine of the TTM; they explain the specific operational mechanics by which an individual progresses across the stages.

The theoretical interaction between stages and processes is predictable and empirically grounded. In the Precontemplation stage (where individuals have no intention of quitting drug use within the foreseeable future), individuals exhibit minimal engagement across all ten processes. As they shift toward Contemplation and Preparation, experiential processes (such as Consciousness Raising, Dramatic Relief, and Self-Re-evaluation) increase markedly. Individuals begin to intellectually and emotionally grasp the severity of their addiction and re-evaluate their self-identity. Finally, as the individual transitions into Action and Maintenance, the experiential processes plateau or decrease slightly, while the behavioral processes (such as Stimulus Control, Counter Conditioning, and Contingency Management) reach peak operational intensity to disrupt conditioned habit loops and establish stable long-term sobriety.

7. Validity

The psychometric integrity of the POC-D has been rigorously evaluated across multiple substantive validation studies in drug-using cohorts, demonstrating robust construct, convergent, discriminant, and predictive validity.

Construct and Structural Validity

Construct validity is evidenced through structural alignment with the theoretical architecture of the TTM. In their foundational validation study on heroin-dependent patients entering treatment, Tejero et al. (1997) evaluated the psychometric properties of the Spanish-language adaptation of the POC-D. Both exploratory and confirmatory factor analyses verified that the 40 items appropriately operationalized the 10 hypothesized constructs. Furthermore, second-order hierarchical modeling validated the conceptual bifurcation into the higher-order experiential and behavioral dimensions, mirroring findings originally observed by DiClemente et al. (1991) in nicotine dependence studies.

Convergent and Concurrent Validity

Convergent validity has been demonstrated through strong, statistically significant correlations with validated instruments assessing stage of change, readiness to change, and substance use severity. Scores on experiential subscales correlate strongly (r values typically ranging from .45 to .65, p < .001) with the Contemplation and Preparation scales of the University of Rhode Island Change Assessment (URICA) and the Stages of Change Readiness and Treatment Eagerness Scale (SOCRATES). Conversely, behavioral subscales show peak positive correlations with the Action scale of the URICA and behavioral markers of treatment compliance, such as attendance at mutual-aid meetings (e.g., Narcotics Anonymous) and therapy sessions.

Discriminant and Predictive Validity

Discriminant validity is supported by the instrument’s capacity to statistically differentiate between disparate clinical subgroups. Individuals in early stages of dependence (Precontemplators) score significantly lower across all ten subscales compared to individuals actively enrolled in intensive outpatient treatment or therapeutic communities (F tests demonstrating significant group separations at p < .001). Predictive validity is demonstrated longitudinally: individuals who actively deploy behavioral processes during the Action stage demonstrate significantly lower rates of relapse to illicit drug use at 6- and 12-month post-treatment follow-ups, validating the theoretical premise that behavioral coping is indispensable for sustaining long-term recovery.

8. Reliability

Empirical evaluations of the POC-D indicate excellent internal consistency and stability across diverse cultural and clinical populations.

Internal Consistency

In the standard 40-item version, each of the ten subscales consists of 4 items. Across multiple validation samples of polysubstance users, heroin-dependent individuals, and cocaine users, Cronbach’s α coefficients consistently demonstrate robust reliability:

• Consciousness Raising: α = .78 – .84
• Dramatic Relief: α = .72 – .81
• Environmental Re-evaluation: α = .76 – .85
• Self-Re-evaluation: α = .79 – .87
• Social Liberation: α = .68 – .76
• Contingency Management: α = .74 – .82
• Counter Conditioning: α = .75 – .83
• Helping Relationships: α = .82 – .89
• Self-Liberation: α = .77 – .86
• Stimulus Control: α = .73 – .82

The overarching second-order domains demonstrate outstanding internal consistency, with the Experiential domain yielding Cronbach’s α values of .89 to .93, and the Behavioral domain yielding α values of .88 to .92. In the abbreviated 20-item version (2 items per subscale), Spearman-Brown prophecy formulas and empirical testing indicate adequate reliability for brief assessment protocols (α = .65 to .80 across subscales; composite domain α > .85).

Test-Retest Stability

Because the processes of change are theoretically dynamic coping activities sensitive to therapeutic intervention and stage transitions, short-term stability is expected to be moderate to high, while long-term stability varies as change progresses. Test-retest evaluations over a 2- to 3-week interval in stable maintenance or precontemplative samples have demonstrated intraclass correlation coefficients (ICCs) and Pearson correlation coefficients ranging from .76 to .88, confirming the psychometric stability of the instrument when behavioral status remains constant.

9. Factor Analysis

Extensive psychometric evaluations utilizing both Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis (CFA) have rigorously established the multidimensional architecture of the POC-D.

First-Order Factor Structure

Early structural investigations conducted using principal axis factoring with promax or oblimin oblique rotations confirmed that the 40 items reliably bifurcate into ten correlated first-order factors matching the TTM theoretical design. Factor loadings for designated primary items are uniformly strong, typically exceeding λ = .55, with minimal cross-loadings (generally < .25). In confirmatory structural equation modeling (SEM), the correlated ten-factor model achieves good overall fit indices across clinical samples:

• Root Mean Square Error of Approximation (RMSEA) ≈ .048 to .056 (indicating good approximate fit)
• Comparative Fit Index (CFI) ≈ .91 to .94
• Tucker-Lewis Index (TLI) ≈ .90 to .93
• Standardized Root Mean Square Residual (SRMR) ≈ .051

Second-Order Hierarchical Structure

To substantiate the conceptual division between cognitive-affective and action-oriented activities, researchers have tested hierarchical structural models. A second-order CFA model—wherein the first-order factors of Consciousness Raising, Dramatic Relief, Environmental Re-evaluation, Self-Re-evaluation, and Social Liberation load onto an Experiential latent variable, while Contingency Management, Counter Conditioning, Helping Relationships, Self-Liberation, and Stimulus Control load onto a Behavioral latent variable—demonstrates parsimonious model fit comparable to the unconstrained ten-factor model (ΔCFI < .01). Second-order factor loadings are notably high, with experiential subscales loading onto the Experiential factor at γ = .68 to .88, and behavioral subscales loading onto the Behavioral factor at γ = .62 to .85. The latent intercorrelation between the Experiential and Behavioral second-order dimensions is moderate to high (r ≈ .65 to .78), reflecting an integrated, dynamic coping system.

10. Instrument / Measurement Tool

The Processes of Change Questionnaire- Drug Version is a structured self-report psychological inventory designed for adolescent and adult clinical and research applications.

• Test Type: Multidimensional self-report rating scale.
• Constructs Measured: Ten covert and overt processes of change (five experiential, five behavioral) in substance use modification.
• Item Count:
  • Full Version: 40 items (4 items per subscale).
  • Short Version: 20 items (2 items per subscale).
• Response Format: 5-point Likert frequency scale:
  • 1 = Never
  • 2 = Seldom
  • 3 = Occasionally
  • 4 = Frequently
  • 5 = Repeatedly
• Administration Time: Approximately 8 to 12 minutes for the 40-item version; 3 to 5 minutes for the 20-item version.
• Scoring Procedures:
  • Raw scores for each of the 10 subscales are calculated by summing or averaging the individual item responses corresponding to that subscale. (Subscale raw scores in the 40-item version range from 4 to 20; average item scores range from 1.0 to 5.0).
  • Higher scores reflect greater engagement in that specific change process over the past month.
  • Higher-order domain scores are generated by averaging the five experiential subscales (Experiential Composite) and the five behavioral subscales (Behavioral Composite).
  • Subscale item mapping (40-item version):
    • Consciousness Raising: Items 15, 24, 33, 40
    • Dramatic Relief: Items 3, 11, 19, 29
    • Environmental Re-evaluation: Items 5, 14, 22, 31
    • Self-Re-evaluation: Items 6, 23, 32, 39
    • Social Liberation: Items 4, 13, 21, 38
    • Contingency Management: Items 1, 9, 27, 36
    • Counter Conditioning: Items 8, 17, 26, 35
    • Helping Relationships: Items 2, 10, 18, 28
    • Self-Liberation: Items 12, 20, 30, 37
    • Stimulus Control: Items 7, 16, 25, 34
  • Subscale item mapping (20-item version):
    • Consciousness Raising: Items 5, 9
    • Dramatic Relief: Items 3, 12
    • Environmental Re-evaluation: Items 4, 14
    • Self-Re-evaluation: Items 8, 15
    • Social Liberation: Items 7, 20
    • Contingency Management: Items 1, 18
    • Counter Conditioning: Items 6, 17
    • Helping Relationships: Items 2, 11
    • Self-Liberation: Items 13, 19
    • Stimulus Control: Items 10, 16

11. Permissions & Fee and Test Year

The theoretical framework of the Processes of Change was formulated in 1983, with the multi-substance and drug-specific adaptations undergoing primary psychometric validation in 1991 and 1997. The instrument is considered an open-access public domain psychometric instrument developed through academic and federally supported research grants (including support from the National Institutes of Health and the National Institute on Drug Abuse). It is made freely accessible for empirical research, non-commercial clinical assessment, and educational purposes.

Researchers and clinicians are permitted to administer the POC-D without paying royalty fees. Instrument documentation and scoring resources are maintained through academic research repositories, including the Health and Addictive Behaviors: Investigating Transtheoretical Solutions (HABITS Laboratory) at the University of Maryland, Baltimore County (UMBC). Proper academic citation of the foundational authors (Prochaska, DiClemente, Velicer, and validation authors such as Tejero et al.) is required in all scientific publications and clinical reports.

12. References

DiClemente, C. C., Prochaska, J. O., Fairhurst, S. K., Velicer, W. F., Velasquez, M. M., & Rossi, J. S. (1991). The process of smoking cessation: An analysis of precontemplation, contemplation, and preparation stages of change. Journal of Consulting and Clinical Psychology, 59(2), 295–304. https://doi.org/10.1037/0022-006X.59.2.295

Prochaska, J. O., & DiClemente, C. C. (1983). Stages and processes of self-change of smoking: Toward an integrative model of change. Journal of Consulting and Clinical Psychology, 51(3), 390–395. https://doi.org/10.1037/0022-006X.51.3.390

Prochaska, J. O., DiClemente, C. C., & Norcross, J. C. (1992). In search of how people change: Applications to addictive behaviors. American Psychologist, 47(9), 1102–1114. https://doi.org/10.1037/0003-066X.47.9.1102

Prochaska, J. O., Velicer, W. F., DiClemente, C. C., & Fava, J. (1988). Measuring processes of change: Applications to the cessation of smoking. Journal of Consulting and Clinical Psychology, 56(4), 520–528. https://doi.org/10.1037/0022-006X.56.4.520

Tejero, A., Trujols, J., Hernández, E., Pérez de los Cobos, J., & Casas, M. (1997). Processes of change assessment in heroin addicts following the Prochaska and DiClemente transtheoretical model. Drug and Alcohol Dependence, 47(1), 31–37. https://doi.org/10.1016/S0376-8716(97)00063-4

Velicer, W. F., Prochaska, J. O., Fava, J. L., Norman, G. J., & Redding, C. A. (1998). Smoking cessation and stress management: Applications of the Transtheoretical Model of behavior change. Homeostasis, 38, 216–233.

13. Items of the Scale (Questionnaire)