There is a shortage of studies that explore adolescents' academic procrastination. The author hence attempted to examine the mechanisms determining Taiwanese adolescent students' perfectionistic tendencies, time management, and academic procrastination. A total of 405 eighth-grade Taiwanese students completed a self-reported survey assessing their perceptions of classroom structure, parental expectations and criticism, perfectionistic tendencies, time management, and academic procrastination. Findings of regression analyses indicated that parental expectations and criticism were the key predictors of students' adaptive and maladaptive perfectionism. Students' perceptions of classroom structure also positively predicted their adaptive perfectionism. Moreover, results of hierarchical regressions suggested that perceived classroom structure, parental expectations and criticism, as well as adaptive perfectionism all emerged as predictors of time management. With regard to procrastination on homework and examination preparation, parental expectations and adaptive perfectionism were negative predictors, whereas parental criticism and maladaptive perfectionism were positive predictors. Also, time management negatively predicted academic procrastination.