The Basic Psychological Need Satisfaction and Frustration Scale (BPNSFS) is a self-report instrument assessing the satisfaction and frustration of the three basic psychological needs of autonomy, competence, and relatedness defined by self-determination theory. The aim of this study was to examine the dimensionality, the predictive validity, and the measurement invariance across different age groups of the Italian version of the BPNSFS. The participants were 2,204 Italian adolescents and young adults (41% males) from 14 to 28 years old (M age = 20.23, SD = 4.25). The invariance across age demonstrated adequate equivalence of the 6-factor model of scales across adolescents (14–18 years) and young adults (20–24 years), showing general homogeneity with respect to the constructs measured in the Italian context. Results of this study suggest that the satisfaction and frustration subscales for each need might be treated separately, because they might have unique effects that should be explored. For this reason, the BPNSFS could be a useful instrument in the counseling context because it can be easily used by operators both for assessment and for evaluation of the effects and results of counseling intervention.
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