This article examined school counselor dispositions (e.g., general self-efficacy, counselor self-efficacy, openness to change, commitment to counseling improvement/professional development) that predict data usage among K-12 professional school counselors. For the study, 130 professional school counselors from Maryland and Virginia completed the School Counselor Attribute and Data Usage Survey. Results indicated that school counselor self-efficacy and general self-efficacy best predict school counselor data usage. (Contains 4 tables.)