LAUSR

Abstract Although perfectionism is a personality disposition that plays an important role in educational contexts, research on perfectionism and school engagement is limited. School engagement is a key process in predicting educational outcomes in students. Consequently, it is important to know how perfectionism relates to school engagement and whether perfectionism predicts relative changes in school engagement over time. Using a sample of 486 students from 6th–12th grade (54% female) and employing a longitudinal design with three waves spaced 4–5 months apart, the present study investigated whether perfectionism (perfectionistic strivings and perfectionistic concerns) predicted relative changes in students' school engagement (behavioral, emotional, and cognitive engagement). Results showed that both perfectionistic strivings and concerns were related to school engagement, but only perfectionistic strivings predicted relative increases in school engagement. Implications for the understanding of how perfectionistic strivings contribute to school students' engagement are discussed.