This course introduces quantitative concepts and tools used in basic research that supports data-driven decision making in the context of educational and clinical services, including school psychology, special education, and forensics. In particular, the focus is given to developing professional knowledge and skills in preparation for assessing academic and behavioral performances, using standard statistical concepts and tools for testing and evaluation, and issues to consider in the interpretation of test scores. Special emphasis is placed on understanding statistical concepts related to test construction and psychometric properties of test scores.