The Self-Determination Scale (SDS)

Abstract

The Self-Determination Scale (SDS) is a psychological instrument designed to quantify individual differences in the extent to which people experience and express self-determination. This construct is viewed as a relatively stable aspect of personality, reflecting two core components: (1) internal awareness of one’s feelings and sense of self, and (2) the feeling of having genuine choice regarding one’s actions and behavior. The SDS is a brief, 10-item measure consisting of two 5-item subscales that can be utilized independently or combined to form a robust, overall index of self-determination.

Keywords

Self-Determination Scale, SDS, self-determination, autonomy, perceived choice, personality assessment, awareness of self, psychological instrument.

Authors

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

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Purpose

The primary purpose of the SDS is to provide a concise and reliable measure of an individual’s chronic tendency toward being self-determining. It is intended for use in research settings to predict psychological outcomes associated with autonomous functioning, such as subjective well-being, intrinsic motivation, and effective goal attainment, consistent with the foundational tenets of Self-Determination Theory.

By assessing self-determination as a generalized personality trait, the SDS allows researchers to examine how this trait interacts with situational factors and contributes to overall mental health and behavioral regulation, distinguishing it from state-level measures of autonomy.

Construct

The SDS measures the global construct of trait-level self-determination, which is captured through two distinct, yet correlated, sub-constructs, each represented by five items:

• Awareness of Oneself: This subscale measures the degree to which an individual feels connected to their internal states, feelings, and core sense of self, rather than feeling alienated or estranged from their emotions or body. High scores indicate a strong sense of self-integration.
• Perceived Choice in One’s Actions: This subscale assesses the degree to which an individual feels their actions are freely chosen and congruent with their personal values, as opposed to feeling coerced or obligated by external pressures. High scores reflect a feeling of behavioral autonomy.

Validity

The SDS demonstrates strong evidence of construct validity, aligning theoretically with established measures within the SDT framework. It consistently shows positive correlations with indicators of psychological health, such as vitality, higher levels of psychological well-being, and internal locus of causality. Conversely, it exhibits negative correlations with indicators of ill-being, such as depression, anxiety, and controlled forms of motivation.

Discriminant validity is supported by findings that the SDS measures a construct distinct from, yet related to, other established personality dimensions. Furthermore, the overall SDS score and its two subscales exhibit predictive validity across diverse domains, including academic performance, work satisfaction, and relationship quality, confirming that the scale effectively captures enduring individual differences in autonomous functioning.

Reliability

The internal consistency of the Self-Determination Scale is typically reported as high, demonstrating that the items within the scale measure a common underlying construct. Initial validation studies, and subsequent replications across various populations, often yield Cronbach’s alpha coefficients ranging from 0.80 to 0.90 for the overall SDS score, indicating excellent reliability.

Temporal stability, or test-retest reliability, has also been established over periods ranging from several weeks to several months. This stability reinforces the interpretation of the SDS as capturing an enduring aspect of the individual’s disposition toward self-determination rather than being susceptible to transient state fluctuations.

Factor Analysis

Psychometric evaluation of the SDS has consistently utilized factor analysis to confirm the measure’s latent structure. Results generally support a two-factor model corresponding precisely to the two hypothesized subscales: Awareness of Self and Perceived Choice in Action.

Although the two factors are highly correlated, suggesting a strong underlying general factor of self-determination, the clear separation into two empirical factors allows researchers to analyze the unique contributions of these distinct facets of autonomous regulation. This dual structure confirms the utility of both the subscale scores and the combined overall SDS score.

Instrument

Test Type: Self-Report Psychological Scale

Format: 10 items presented as forced-choice pairs (A vs. B), rated on a 5-point bipolar scale to indicate the relative truth of statement A versus statement B.

Language Available: English (Original), with numerous validated translations available for international research purposes.

Population Group: General population; utilized extensively in non-clinical and educational settings.

Age Group: Adolescents and Adults (typically 16 years and older).

Population Details: Applicable for use with individuals capable of self-reflection and comprehension of abstract psychological concepts.

Test Methodology: The scale uses a comparative methodology where respondents assess the personal relevance of contrasting statements, yielding a score reflecting the degree of self-determination experienced in their daily lives.

Keywords

Autonomous functioning, psychological well-being, competence, relatedness, intrinsic motivation, trait assessment, personality inventory.

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Authors

Author ORCID Identifier: N/A (Identifiers not provided in source data.)

Affiliation Email addresses: Contact information generally managed through the Center for Self-Determination Theory (SDT) resources.

Correspondence Address: Correspondence is typically directed to the primary authors at their academic institutions (e.g., University of Missouri or University of Rochester).

Permissions & Fee and Test Year

The Self-Determination Scale is frequently made available for non-commercial academic research purposes without charge, consistent with the open-source philosophy often adopted by researchers associated with Self-Determination Theory. Commercial or clinical use may require specific negotiation with the authors or designated institutions.

The scale was initially developed and validated in the mid-1990s, with the primary psychometric reference published in 1996.

Reference’s

• 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.
• Sheldon, K. M. (1995). Creativity and self-determination in personality. Creativity Research Journal, 8, 61-72.
• For comprehensive information and access to the scale, refer to the official Self-Determination Theory website: http://selfdeterminationtheory.org

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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.

Instructions: Please read the pairs of statements‚ one pair at a time‚ and think about which statement within the pair seems more true to you at this point in your life. Indicate the degree to which statement A feels true‚ relative to the degree that Statement B feels true‚ on the 5-point scale shown after each pair of statements. If statement A feels completely true and statement B feels completely untrue‚ the appropriate response would be 1. If the two statements are equally true‚ the appropriate response would be a 3. If only statement B feels true And so on.

1.

A. I always feel like I choose the things I do.

B. I sometimes feel that its not really me choosing the things I do.

2.

A. My emotions sometimes seem alien to me.

B. My emotions always seem to belong to me.

3.

A. I choose to do what I have to do.

B. I do what I have to‚ but I donÕt feel like it is really my choice.

4.

A. I feel that I am rarely myself.

B. I feel like I am always completely myself.

5.

A. I do what I do because it interests me.

B. I do what I do because I have to.

6.

A. When I accomplish something‚ I often feel it wasn’t really me who did it.

B. When I accomplish something‚ I always feel it’s me who did it.

7.

A. I am free to do whatever I decide to do.

B. What I do is often not what I’d choose to do.

8.

A. My body sometimes feels like a stranger to me.

B. My body always feels like me.

9.

A. I feel pretty free to do whatever I choose to.

B. I often do things that I don’t choose to do.

10.

A. Sometimes I look into the mirror and see a stranger.

B. When I look into the mirror I see myself.