We created a comprehensive, reliable, and valid morphological awareness assessment tool for students in grades 1-6: the MATRS (Morphological Awareness Test for Reading and Spelling). We targeted these grades for our project because research has demonstrated significant and sustained growth in morphological awareness across these school years (e.g., Berninger, Abbott, Nagy, & Carlisle 2010) and that morphological awareness interventions in these elementary school years lead to gains in morphological awareness and literacy skills in relatively short amounts of time (e.g., Apel, Brimo, Diehm, & Apel, 2013; Bower, Kirby, & Deacon, 2010; Goodwyn & Ahn, 2013). This technical manual details the results of the project.