Social work theory · Volume E: Strengths, Agency & Meaning
Self-determination theory
Self-determination theory (SDT) is a theory of human motivation, development and wellbeing developed by Edward Deci and Richard Ryan.
Type: psychological theory of motivation and personality, supported by an extensive empirical research program.
1. What it is
Self-determination theory (SDT) is a theory of human motivation, development and wellbeing developed by Edward Deci and Richard Ryan. It proposes that people have an inherent tendency towards growth, integration and psychological health, and that this tendency is supported or undermined by the social environment (Ryan & Deci, 2000). The theory distinguishes between types of motivation according to how far behaviour is self-endorsed. It argues that the quality of motivation matters more for persistence and wellbeing than its quantity (Ryan & Deci, 2017). For social work, SDT offers an empirical basis for the profession’s long-standing commitment to client self-determination, and a theoretical explanation for why autonomy-supportive practice, such as motivational interviewing, is effective.
SDT is organised as a set of linked mini-theories. These include cognitive evaluation theory (how rewards and controls affect intrinsic motivation), organismic integration theory (how external regulations become internalised), basic psychological needs theory, causality orientations theory, goal contents theory and relationships motivation theory (Ryan & Deci, 2017).
Basic psychological needs. SDT proposes three universal psychological needs whose satisfaction is essential for wellbeing (Deci & Ryan, 2000).
Autonomy. Autonomy is the need to experience one’s behaviour as self-endorsed and volitional. It concerns acting from one’s own values and interests. In SDT, autonomy differs from independence: a person can rely on others and still act autonomously if they endorse that reliance (Chirkov et al., 2003). The concept draws on deCharms’s (1968) idea of personal causation.
Competence. Competence is the need to feel effective in one’s interactions with the environment and to experience mastery. It builds on White’s (1959) concept of effectance motivation. Optimal challenge and informative feedback support competence.
Relatedness. Relatedness is the need to feel connected to and cared for by others, and to care for them. Relatedness supports internalisation, because people more readily take on values modelled by those they feel connected to (Ryan & Deci, 2000).
Intrinsic motivation. Intrinsic motivation is doing an activity for its inherent interest and enjoyment. Early experiments found that expected tangible rewards for an interesting task can reduce subsequent intrinsic motivation (Deci, 1971). A later meta-analysis confirmed this undermining effect for expected, tangible rewards (Deci et al., 1999).
The extrinsic motivation continuum. Extrinsic motivation is doing something for an outcome separate from the activity itself. Organismic integration theory places types of extrinsic motivation on a continuum of relative autonomy (Ryan & Deci, 2000). At one end is amotivation, a lack of intention to act. External regulation follows, where behaviour is driven by rewards or punishments. Introjected regulation involves acting to avoid guilt or gain approval. Identified regulation involves valuing the goal personally. Integrated regulation occurs when the behaviour fits fully with a person’s other values. Intrinsic motivation sits at the autonomous end. Identified, integrated and intrinsic motivation are grouped as autonomous motivation; external and introjected as controlled motivation.
Links to motivational interviewing. Motivational interviewing (MI) is a collaborative counselling style for strengthening a person’s own motivation for change (Miller & Rollnick, 2013). It developed separately from SDT, but several authors have argued that SDT provides its theoretical explanation (Markland et al., 2005; Vansteenkiste & Sheldon, 2006). MI’s respect for autonomy, its evocation of the person’s own reasons for change and its provision of information without pressure correspond to SDT’s account of autonomy support and internalisation.
2. Historical development
| Period | Development |
|---|---|
| 1959–1968 | White’s competence motivation and deCharms’s personal causation |
| 1971 | Deci’s experiments on the effects of external rewards on intrinsic motivation |
| 1975–1985 | Cognitive evaluation theory developed; Deci and Ryan publish Intrinsic Motivation and Self-Determination in Human Behavior (1985) |
| 1989 | Ryan and Connell measure the continuum of regulation |
| 1999 | Deci, Koestner and Ryan’s meta-analysis of reward effects |
| 2000 | Major statements in American Psychologist and Psychological Inquiry |
| 2005–2006 | SDT proposed as the theoretical basis for motivational interviewing |
| 2017 | Ryan and Deci’s comprehensive volume consolidates the six mini-theories |
SDT grew from experimental social psychology and from the humanistic tradition in Family A. It challenged the dominant behavioural view that reward and punishment were the main drivers of behaviour (Deci, 1971). It also built on organismic theories that see people as active and growth-oriented. Over four decades, Deci, Ryan and colleagues tested the theory in education, work, health, sport and parenting. This large empirical base made SDT one of the most influential theories of motivation in psychology (Ryan & Deci, 2017).
SDT entered social work mainly through health, addiction and mental health practice, where it was linked to motivational interviewing and to research on treatment adherence. A meta-analysis of SDT in health contexts found that autonomy support predicted need satisfaction, autonomous motivation and better health outcomes (Ng et al., 2012). The theory is now cited in social work as evidence that self-determination is a condition for lasting change as well as an ethical principle (Payne, 2021).
3. Practical guidance
SDT suggests that practitioners can strengthen motivation by supporting autonomy, competence and relatedness.
- Provide choice and rationale. Offer meaningful options where possible, and explain the reasons for any requirements. Clear rationales help people internalise goals they did not choose (Ryan & Deci, 2017).
- Acknowledge feelings and perspectives. Recognise a person’s reluctance or frustration without pressure. Feeling understood supports autonomous motivation.
- Avoid controlling language. Phrases such as “you must” or “you should” tend to produce compliance or resistance. In mandated settings, be transparent about requirements while preserving choice within them.
- Use motivational interviewing. Elicit the person’s own reasons for change, reflect ambivalence, and respect their right to decide (Miller & Rollnick, 2013).
- Build competence through structure. Set achievable goals, offer clear feedback and break tasks into manageable steps.
- Strengthen relatedness. A warm, reliable relationship supports internalisation. Connections with family, peers and community serve the same function.
- Be cautious with incentives. Rewards can help initiate behaviour but may undermine interest if they are perceived as controlling (Deci et al., 1999).
4. Critical evaluation
Strengths. SDT has a large and consistent evidence base across cultures and settings (Ryan & Deci, 2017). It offers a precise account of different types of motivation and practical guidance for supporting change. Its emphasis on autonomy is consistent with the AASW (2020) commitment to self-determination. It explains why coercive approaches often produce short-term compliance without lasting change, and why relationships matter to motivation.
Limitations. Critics have questioned whether autonomy is a universal need or a value of individualistic Western cultures. SDT researchers respond that autonomy means self-endorsement, which can include endorsing interdependence (Chirkov et al., 2003), but the debate continues. The theory focuses on individual psychological processes and says less about poverty, discrimination and structural constraint. Social workers in statutory roles may also find tension between autonomy support and legal mandates.
Overall importance. SDT is the leading psychological theory of autonomy and motivation. For social work, it provides empirical support for self-determination, explains the effectiveness of motivational interviewing and informs practice in health, addiction, education and child and family work. It is best combined with attention to the social conditions that constrain choice.
5. References
- Australian Association of Social Workers. (2020). Code of ethics. AASW.
- Chirkov, V., Ryan, R. M., Kim, Y., & Kaplan, U. (2003). Differentiating autonomy from individualism and independence: A self-determination theory perspective on internalization of cultural orientations and well-being. Journal of Personality and Social Psychology, 84(1), 97–110. https://doi.org/10.1037/0022-3514.84.1.97
- deCharms, R. (1968). Personal causation: The internal affective determinants of behavior. Academic Press.
- Deci, E. L. (1971). Effects of externally mediated rewards on intrinsic motivation. Journal of Personality and Social Psychology, 18(1), 105–115. https://doi.org/10.1037/h0030644
- Deci, E. L., Koestner, R., & Ryan, R. M. (1999). A meta-analytic review of experiments examining the effects of extrinsic rewards on intrinsic motivation. Psychological Bulletin, 125(6), 627–668. https://doi.org/10.1037/0033-2909.125.6.627
- Deci, E. L., & Ryan, R. M. (1985). Intrinsic motivation and self-determination in human behavior. Plenum.
- Deci, E. L., & Ryan, R. M. (2000). The “what” and “why” of goal pursuits: Human needs and the self-determination of behavior. Psychological Inquiry, 11(4), 227–268. https://doi.org/10.1207/S15327965PLI1104_01
- Markland, D., Ryan, R. M., Tobin, V. J., & Rollnick, S. (2005). Motivational interviewing and self-determination theory. Journal of Social and Clinical Psychology, 24(6), 811–831. https://doi.org/10.1521/jscp.2005.24.6.811
- Miller, W. R., & Rollnick, S. (2013). Motivational interviewing: Helping people change (3rd ed.). Guilford Press.
- Ng, J. Y. Y., Ntoumanis, N., Thøgersen-Ntoumani, C., Deci, E. L., Ryan, R. M., Duda, J. L., & Williams, G. C. (2012). Self-determination theory applied to health contexts: A meta-analysis. Perspectives on Psychological Science, 7(4), 325–340. https://doi.org/10.1177/1745691612447309
- Payne, M. (2021). Modern social work theory (5th ed.). Red Globe Press.
- Ryan, R. M., & Connell, J. P. (1989). Perceived locus of causality and internalization: Examining reasons for acting in two domains. Journal of Personality and Social Psychology, 57(5), 749–761. https://doi.org/10.1037/0022-3514.57.5.749
- Ryan, R. M., & Deci, E. L. (2000). Self-determination theory and the facilitation of intrinsic motivation, social development, and well-being. American Psychologist, 55(1), 68–78. https://doi.org/10.1037/0003-066X.55.1.68
- Ryan, R. M., & Deci, E. L. (2017). Self-determination theory: Basic psychological needs in motivation, development, and wellness. Guilford Press.
- Vansteenkiste, M., & Sheldon, K. M. (2006). There’s nothing more practical than a good theory: Integrating motivational interviewing and self-determination theory. British Journal of Clinical Psychology, 45(1), 63–82. https://doi.org/10.1348/014466505X34192
- White, R. W. (1959). Motivation reconsidered: The concept of competence. Psychological Review, 66(5), 297–333. https://doi.org/10.1037/h0040934