Morphological awareness-the ability to recognize, understand, and consciously use the smallest units of meaning in a word-is one of the most important skills for literacy development. For use with students in Grades 1-6, MATRS (TM) is a comprehensive, reliable, and valid assessment tool for evaluating the morphological awareness skills that strongly predict concurrent and future reading and spelling abilities. With this manual, users will: Get a detailed overview of the development and benefits of MATRS Learn how to administer MATRS accurately and efficiently Score MATRS and interpret the scores for various populations Provide results to other professionals and students' parents Learn from three MATRS case studies and see how the assessment data informed what the examiner did next Review the technical information behind the development of MATRS Concise and comprehensive, this manual will help special educators, school psychologists, reading specialists, and other professionals use MATRS to accurately identify students with morphological awareness deficits and plan differentiated literacy instruction and intervention.