Proponents of positive psychology have argued for more comprehensive assessments incorporating positive measures (e.g., student strengths) as well as negative measures (e.g., psychological symptoms). However, few variable-centered studies have addressed the incremental validity of positive assessment data. The authors investigated the incremental validity of positive emotions relative to negative emotions in predicting adolescents' adaptive school functioning. Positive emotions demonstrated significant incremental validity in predicting school satisfaction, adaptive coping, and student engagement, but not self-reported GPA. The findings offer some support for the utility of positive measures in psychoeducational assessments. (Contains 4 tables.)