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(PsycInfo Database Record (c) 2021 APA, all rights reserved).The Behavior Assessment System for Children-Third Edition (BASC-3) is the most recent edition and the Teacher Rating Scales (TRS) was reported to be the most frequently used test in school psychology practice. Despite its popularity, there is a lack of independent empirical research regarding psychometric properties. The BASC-3 Manual, while quite detailed in many respects, lacks important details in reporting TRS item- and scale-level factor analyses limiting confidence in co