The Self-Determination Scale (SDS)

Abstract

The Self-Determination Scale (SDS) is a concise, 10-item psychological scale designed to measure individual differences in the degree to which people function in a self-determined manner. Developed primarily by Sheldon and Ryan, the SDS operationalizes key aspects of Self-Determination Theory (SDT), treating self-determination as a relatively enduring aspect of an individual’s personality. It captures the extent to which an individual experiences their actions as internally chosen and reflective of their true self.

The instrument is structured around two distinct 5-item subscales: Awareness of Self (reflecting the degree to which one is aware of and connected to one’s feelings and sense of self) and Perceived Choice in Actions (reflecting the feeling of autonomy and choice regarding one’s behavior). These subscale scores can be utilized independently or combined to form a single, overall SDS score representing general self-determination.

Keywords

Self-Determination Scale, SDS, Self-Determination Theory, SDT, Autonomy, Competence, Personality, Psychological Measurement, Perceived Choice, Awareness of Self, Motivation.

Authors

Kenneth M. Sheldon, Richard M. Ryan, Holly Reis.

Purpose

The primary purpose of the SDS is to provide a reliable and efficient measure of characteristic individual differences in the tendency toward self-determination. Unlike state measures that capture momentary feelings of autonomy, the SDS aims to assess self-determination as a stable trait or orientation within a person’s personality structure.

The scale allows researchers and practitioners to quantify the degree to which an individual operates from a position of volitional choice versus external pressure or internal compulsion. This measurement is crucial for understanding outcomes related to well-being, motivation, goal attainment, and general psychological adjustment.

Construct

The SDS is explicitly grounded in the tenets of Self-Determination Theory (SDT), a macro-theory of human motivation and personality. The scale specifically measures two facets integral to the experience of self-determination: Awareness of Self and Perceived Choice.

The Awareness of Self dimension reflects the degree of integration and authenticity—the sense that one’s actions, feelings, and body belong to oneself, rather than feeling alien or disconnected. The Perceived Choice dimension captures the subjective experience of autonomy, focusing on the feeling that one is the origin of their actions and is freely choosing their behavior, even when fulfilling duties.

Validity

Initial validation studies demonstrated the SDS’s strong construct validity. Scores on the SDS correlate positively with measures of psychological adjustment, well-being, intrinsic motivation, and goal attainment, and correlate negatively with measures of depression, anxiety, and external control orientation. The scale is often validated against other established measures of motivational style and life satisfaction, confirming that higher self-determination is linked to healthier psychological functioning.

The scale’s ability to predict behavioral outcomes that theoretically depend on volitional functioning (e.g., persistence in challenging tasks, maintenance of health behaviors) further supports its predictive validity across diverse populations and contexts.

Reliability

The SDS typically exhibits good internal consistency, with Cronbach’s alpha coefficients generally falling in the acceptable range (often between .70 and .85) for both the overall scale and its two subscales (Awareness and Choice). This indicates that the items within each subscale reliably measure the same underlying dimension.

Furthermore, test-retest reliability has been established across various time intervals, supporting the conceptualization of self-determination as a relatively stable trait or personality orientation, rather than a transient state.

Factor Analysis

Exploratory and confirmatory factor analyses consistently support the proposed two-factor structure of the SDS: Awareness of Self and Perceived Choice in Actions. This structure aligns perfectly with the theoretical components derived from Self-Determination Theory regarding trait-level autonomy.

Although the two factors are empirically distinct, they are typically moderately correlated, allowing for the creation of a reliable total self-determination score by summing the items. This dual structure confirms the theoretical separation of internal integration (awareness) and volitional agency (choice) as core components of trait self-determination.

Instrument

Test Type: Self-report psychological scale designed to assess trait-level orientation.

Format: 10 items presented in a bipolar choice format (Statement A vs. Statement B) using a 5-point scale where respondents indicate the degree to which A or B feels true.

Language Available: Primarily English, with numerous validated translations available for cross-cultural research.

Population Group: General population, including adolescents and adults.

Age Group: Typically 16 years and older.

Population Details: Originally validated on college student samples but extensively used across diverse demographic and clinical groups studying motivation and well-being.

Test Methodology: Respondents select a number from 1 (Only A feels true) to 5 (Only B feels true) to indicate the relative truthfulness of two opposing statements describing their sense of self and behavior.

Keywords

Psychological adjustment, Intrinsic motivation, Trait measurement, Volition, Psychological needs, Self-regulation, Well-being.

Authors

Author ORCID Identifier: N/A (Please consult contemporary academic directories).

Affiliation Email addresses: Please refer to the official Self-Determination Theory website for current contact information.

Correspondence Address: Correspondence is typically handled through the primary researchers’ current university affiliations (e.g., University of Missouri or University of Rochester).

Permissions & Fee and Test Year

The Self-Determination Scale (SDS) is generally available for non-commercial academic research without charge, consistent with the philosophy of the developers of Self-Determination Theory. Researchers are typically asked to credit the authors and cite the original publications when using the scale.

The scale was initially developed and published around 1995–1996, based on foundational work exploring personality correlates of self-determination.

For commercial use or clinical application, specific written permission from the authors or copyright holders (K. M. Sheldon and R. M. Ryan) may be required. Further details regarding permissions and usage guidelines are maintained on the official Self-Determination Theory website.

Reference’s

• Sheldon, K. M. (1995). Creativity and self-determination in personality. Creativity Research Journal, 8, 61-72.
• Sheldon, K. M., Ryan, R. M., & Reis, H. (1996). What makes for a good day? Competence and autonomy in the day and in the person. Personality and Social Psychology Bulletin, 22, 1270-1279.
• Official resource for the scale: http://selfdeterminationtheory.org

Items of the The Self-Determination Scale (SDS)

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way.