Intrinsic Motivation Inventory (IMI) is a multidimensional measurement grounded on the Self-DeterminationTheory (SDT) used in assessing the subjective experiences of participants whendeveloping an activity. The aim of this study is to analyze the characteristics of IMI among Portuguesestudents, testing four organizational models (unidimensional, multidimensional, hierarchical andbi-factor). A total of 3685 students from the 5th to the 12th grades (50.4% boys) participated in thestudy (M = 13.67, SD = 2.26). Two versions of IMI were used (First Language and Mathematics)with twenty-one items distributed over five subscales: Enjoyment, Perceived Competence, Pressure/Tension, Perceived Choice and Value/Utility. The confirmatory factor analysis corroborated themultidimensionality of intrinsic motivation, and that the bi-factor model presented the best fit indexes.This model showed the existence of one general factor, resulting from the contribution of all individualdimensions and the particularities of most of them. Furthermore, results also highlighted satisfactoryreliability scores both through Cronbach’s alpha scores and Composite reliability scores. Theseresults indicate that this scale is appropriate to evaluate the underlying constructs of the theoreticalmodel of SDT and allows for the calculation of a global measure of intrinsic motivation, as well asspecific measures for their predictors.
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