| name | grad-sdt |
| description | Apply Self-Determination Theory to analyze motivation quality along the autonomy continuum and design interventions that satisfy basic psychological needs. Use this skill when the user needs to diagnose why intrinsic motivation is declining, evaluate incentive structures for motivational crowding, design need-supportive environments, or when they ask 'why did rewards backfire', 'how to foster intrinsic motivation', or 'what needs drive engagement'. |
| metadata | {"category":"WP-29 心理學理論","tags":["self-determination-theory","intrinsic-motivation","autonomy","competence","relatedness","Deci-Ryan","overjustification"]} |
Self-Determination Theory (SDT)
Overview
Self-Determination Theory (Deci & Ryan, 1985, 2000) posits that human motivation varies in quality along a continuum of autonomy, from amotivation through external regulation to fully intrinsic motivation. Optimal functioning and well-being depend on satisfying three basic psychological needs: autonomy, competence, and relatedness.
When to Use
- Diagnosing why engagement or performance has declined after introducing incentives
- Designing reward systems that avoid undermining intrinsic motivation
- Evaluating organizational or educational environments for need satisfaction
- Understanding motivation quality beyond simple "motivated vs. unmotivated" framing
When NOT to Use
- When behavior is driven purely by survival needs or physiological deprivation
- As a substitute for structural analysis (e.g., resource constraints mistaken for motivation issues)
- When the context requires a trait-based personality model rather than a motivational framework
Assumptions
IRON LAW: External rewards can UNDERMINE intrinsic motivation
(overjustification effect) — incentive design must consider
motivational crowding. Tangible, expected, contingent rewards
are the most damaging to autonomous motivation.
Key assumptions:
- Three basic needs (autonomy, competence, relatedness) are universal across cultures
- Motivation quality matters more than motivation quantity for sustained outcomes
- Social contexts that support need satisfaction promote internalization of extrinsic motivation
Methodology
Step 1 — Assess Current Motivation Quality
Classify target behavior on the motivation continuum:
| Regulation Type | Locus | Description |
|---|
| Amotivation | None | No intention to act |
| External | External | Act for reward/punishment |
| Introjected | Somewhat external | Act to avoid guilt or gain approval |
| Identified | Somewhat internal | Act because valued personally |
| Integrated | Internal | Act because consistent with self |
| Intrinsic | Internal | Act for inherent enjoyment |
Step 2 — Diagnose Need Satisfaction/Frustration
For each basic need, assess whether the environment supports or thwarts it:
- Autonomy: choice, volition, self-endorsement of actions
- Competence: effectance, mastery, optimal challenge
- Relatedness: belonging, connection, feeling significant to others
Step 3 — Identify Motivational Crowding Risks
Check for overjustification triggers: tangible rewards, expected rewards, task-contingent rewards, surveillance, deadlines, imposed goals, competition.
Step 4 — Design Need-Supportive Intervention
- Provide meaningful rationale (autonomy support)
- Offer choice within structure (autonomy + competence)
- Deliver informational rather than controlling feedback (competence)
- Foster collaborative rather than competitive contexts (relatedness)
Output Format
## SDT Motivation Analysis: [Context]
### Current Motivation Profile
| Behavior | Regulation Type | Need Gaps |
|----------|----------------|-----------|
| [behavior] | [type] | [autonomy/competence/relatedness] |
### Need Satisfaction Assessment
- Autonomy: [supported/thwarted] — [evidence]
- Competence: [supported/thwarted] — [evidence]
- Relatedness: [supported/thwarted] — [evidence]
### Crowding Risk
- [Identified overjustification triggers and severity]
### Recommendations
1. [Need-supportive intervention]
2. [Incentive redesign if applicable]
3. [Environmental change]
Gotchas
- Not all extrinsic motivation is bad — identified and integrated regulation can be highly effective and durable
- Cultural context moderates how autonomy is expressed (individualist vs. collectivist), but the need itself remains universal per SDT
- Removing rewards after they have undermined intrinsic motivation does not automatically restore it
- Informational feedback supports competence; controlling feedback undermines autonomy — delivery framing matters
- SDT applies to volitional behavior; under coercion or extreme deprivation, need hierarchy models may be more relevant
- Competence without autonomy still feels controlling — all three needs must be addressed together
References
- Deci, E. L. & Ryan, R. M. (1985). Intrinsic motivation and self-determination in human behavior. Plenum Press.
- 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.
- 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.
