Description

The Stages of Change Questionnaire – Revised (SCQ-R) is an assessment instrument designed to evaluate the stage of behavioural change in which an individual is currently positioned regarding a specific behaviour. The questionnaire is based on the Transtheoretical Model of Behaviour Change developed by Prochaska and DiClemente, which proposes that behavioural change is not a linear process but develops through a series of distinct stages.

The SCQ-R is widely used in health psychology and behavioural research to understand readiness for change and to design interventions that correspond to the individual’s current motivational stage.

Objective

The primary objective of the Stages of Change Questionnaire – Revised is to identify the stage of change in which an individual is located regarding a specific behaviour.

The questionnaire can be applied to behaviours such as smoking cessation, increasing physical activity, improving dietary habits, and other lifestyle changes.

The assessment helps researchers and professionals understand an individual’s readiness for change and select appropriate strategies to support behavioural modification.

Theoretical Framework and Stages of Change

The SCQ-R is based on the Transtheoretical Model, which describes behavioural change through the following stages:

Precontemplation: The individual does not recognize the need for change and has no intention of changing behaviour in the near future.

Contemplation: The individual recognizes the need for change and considers modifying the behaviour but has not yet decided to take action.

Preparation: The individual is ready to make changes and has begun planning specific steps to achieve behavioural modification.

Action: The individual has initiated behavioural changes and is implementing planned strategies.

Maintenance: The individual has maintained the new behaviour for an adequate period and is working to preserve the change.

Relapse: The individual returns to previous habits and may need to restart the change process.

Structure and Scoring Method

The calibration of the SCQ-R includes questions that ask individuals to evaluate the stage they are currently experiencing regarding the change of a specific behaviour.

Responses are used to classify participants into one of the stages of change according to the Transtheoretical Model.

The interpretation of results focuses on readiness for change rather than simply measuring the presence or absence of a behaviour. Individuals in later stages indicate greater readiness and active involvement in behavioural modification.

Data Analysis and Use

The SCQ-R provides information about motivational readiness and behavioural change processes.

The collected data can be analysed to examine differences between individuals or groups according to their stage of change and to investigate relationships between readiness for change and other psychological or health-related variables.

Possible statistical analyses include descriptive statistics, comparisons between groups, correlation analyses, and evaluation of intervention effectiveness according to participants’ initial stage of change.

The questionnaire is particularly useful in designing personalized interventions, as strategies can be adapted according to whether individuals are in the precontemplation, contemplation, preparation, action, maintenance, or relapse stage.

Validity and Reliability

The psychometric evaluation of the SCQ-R is based on research examining the applicability of the Transtheoretical Model in different behavioural domains.

Studies have supported the usefulness of the stages-of-change approach in predicting readiness for behavioural modification and evaluating health behaviour interventions.

Applications

The Stages of Change Questionnaire – Revised can be applied in health promotion, smoking cessation programs, exercise adherence interventions, nutritional behaviour modification, addiction treatment, and lifestyle change research.

It is particularly valuable for identifying individual motivational characteristics and supporting targeted behavioural interventions.

References

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.

Prochaska, J. O., & Velicer, W. F. (1997). The transtheoretical model of health behavior change. American Journal of Health Promotion, 12(1), 38–48.

DiClemente, C. C., & Prochaska, J. O. (1982). Self-change and therapy change of smoking behavior: A comparison of processes of change in cessation and maintenance. Addictive Behaviors, 7(2), 133–142.

Nigg, C. R. (2000). The transtheoretical model of behavior change: A decade later. Health Education & Behavior, 27(6), 110–129.

James, S. A., & Linton, J. M. (2010). Stages of change and exercise adherence: The role of cognitive and behavioral processes. Journal of Behavioral Medicine, 33(2), 133–145.