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© 2019 Elsevier Ltd Objectives: Research guided by Self-determination Theory (Deci & Ryan, 1985; Ryan & Deci, 2017) has repeatedly demonstrated the importance of focusing on both the bright (satisfaction) and dark (frustration) sides of the three basic psychological needs. Recently, researchers have also argued for the utility of assessing a third need state, that of “unfulfillment”. In this paper, we outline an effort to develop and provide initial validity evidence for scores of a new multidimensional and sport-specific measure, the Psychological Need States in Sport-Scale (PNSS-S), to assess the satisfaction, frustration, and unfulfillment of all three needs. Method: In Study 1, we developed 46 candidate items, and tested evidence for the factorial structure of the responses to the newly developed items, internal consistency and discriminant validity of the subscale scores. Following refinement, the replication of the favored model was tested using an independent sample of athletes in Study 2. Evidence for the nomological network of the subscales of the new measure was also demonstrated in Study 2. Results: Factor models incorporating all three need states showed poor fit with the data. However, following post-hoc modifications, a six-factor model assessing the need states of satisfaction and frustration, separately for autonomy, competence, and relatedness, was found to have good fit to the data. After refinement, the 29-item six-factor model was found to demonstrate good fit, good standardized factor loadings, factor correlations in the expected directions, and acceptable estimates of internal consistency in Study 2. Tests of nomological networks showed that the six need states were significantly predicted by contextual autonomy, competence, and relatedness support/thwarts as expected. Autonomy and competence need satisfaction were significantly associated with engagement; and competence and relatedness need satisfaction were significantly associated with posit

© 2019 Elsevier Ltd. Objectives: Various self-report measures based on Self-Determination Theory (Deci & Ryan, 1985; Ryan & Deci, 2017) have been developed to assess athletes’ perceptions of their coaches’ need supportive and thwarting behaviors. We propose that it is also conceptually important to distinguish between coaching behaviors that thwart and those that are indifferent to athletes’ psychological needs. This distinction is useful, as we contend that athletes’ degree of need frustration, and concomitant negative outcomes, are likely to be more pronounced in a coaching environment that actively thwarts (vs. is indifferent to) athletes’ needs. In this three-study paper, we outline the conceptual rationale for, the development of, and initial validity evidence for a tripartite (need supportive, thwarting, and indifferent) measure of interpersonal behaviors of coaches (TMIB-C). Method: In Study 1, we developed 54 candidate items and gathered evidence for their face and content validity with athletes and an expert panel. Competing factor models were tested in Study 2 to determine the best representation of the measure's factor structure. In Study 3, we tested the replication of such models and the nomological network surrounding the identified factors. Results: In Study 2, a 22-item, three-factor structure (supportive, thwarting, and indifferent behaviors) using exploratory structural equation modeling, demonstrated acceptable fit, good standardized factor loadings, factor correlations in the expected directions, and acceptable estimates of internal consistency. This model was replicated in Study 3. Tests of nomological networks showed that as expected, need indifference was a weaker predictor of autonomy and competence need frustration as compared to need thwarting, and the only significant predictor of irrelevant thoughts. Unexpectedly however, need indifference, when compared to need thwarting, was as good a predictor of exhaustion and a better predictor of re