Why it is a question
Self-determination theory names three basic needs, autonomy, competence and relatedness, and defends them by criteria. Vansteenkiste, Ryan and Soenens 2020 list nine (NOTE-440, Table 2). The “essential” and “distinct” criteria are the theory’s attempt at this question. If well-being is measured by the satisfaction of the same needs, a need claim cannot be tested without assuming the measure. NOTE-439’s “Interdefinition” limitation says so.
The record’s evidence bears on it in four places:
- Candidates that fail. Martela and Ryan (LIT-1983, held second-hand in NOTE-440) class beneficence a wellness enhancer, not a need, because its frustration adds no variance. Lubics et al. 2026 (LIT-1980) test it again.
- Rival candidates. Sheldon et al. 2001 (LIT-1966) found self-esteem strong among ten candidates. NOTE-440 holds SDT’s reply, that it is derivative.
- Frustration as a separate test. THEORY-052 holds that need frustration predicts ill-being apart from low satisfaction. Murphy et al. 2023 (LIT-1978) argue the frustration scale may largely measure item keying.
- The measures themselves (Kermavnar et al. 2024, LIT-1988).
What would answer it
A criterion for need-hood that does not pass through the same well-being measure. For example: a functional deficit, not a report, that follows thwarting of the candidate need and not of a matched enhancer, under intervention rather than correlation. Or a showing that the interdefinition is harmless because the nine criteria fix the needs independently.
Bears on
THEORY-052 and CLAIM-368, the record’s own use of frustration as a primitive, which inherits whatever this question finds about need frustration’s measurement.
Note of 2026-11-03: the readings
- No functional measure exists. All 31 need scales Kermavnar et al. map are self-reports (NOTE-1509), so none measures the functional deficit this question’s answer calls for. Candidate needs are proposed because the three needs’ frustration “may not adequately predict … ill-being”: the well-being route itself.
- The measures do not separate the needs. In Patrick et al. 2007 (NOTE-1515), corrected for unreliability, autonomy and competence correlate .96 and autonomy and relatedness .86. The frustration test sorts partly by keying (Murphy et al., NOTE-1530).
- SDT’s own researchers raised the question. Sheldon et al. 2001 (NOTE-1502) weighed treating self-esteem as an outcome, called that “imprudent”, and concluded “there may be four fundamental psychological needs”. NOTE-440’s “derivative” reply answers them.
- One criterion off the well-being route, weak. Chen et al. find need satisfaction helps whether or not the need is valued or desired (NOTE-1527). It cannot tell a need from a universal enhancer.
- Circularity elsewhere. Niemiec et al. define intrinsic aspirations by their link to the needs (NOTE-1520), so their mediation inherits it.
Martela and Ryan and Lubics et al. are Unfetched, so beneficence is still held second-hand. The question stays open.
Note of 2026-11-03 (later): La Guardia et al., read
La Guardia et al. 2000 (NOTE-1523) give the interdefinition worry at the level of an instrument. The need that best predicts attachment security, relatedness, has items closest to security in content, so the authors repeat every analysis without it. The results hold for autonomy and competence, which is their answer. And the variance is mostly across partners, so a need’s satisfaction is a property of a person in a relationship, not of a person.