The Rasch Model was used to define the word analysis skill variable and to develop, field test, and calibrate a corresponding test for grades 2-12: the Emory Word Analysis Skill Inventory (EWASI). Word analysis objectives focusing on content and hierarchical levels of difficulty were identified and field tested with 78 students, grades 2-12, enrolled in a clinical reading program. The original 431 items in 22 subscales were then calibrated to parallel forms A and B. Each form contained 137 items in 13 subscales and three subgroups labelled: consonants, vowels, and word structure; 134 items clearly fit the test. Each form has the same item difficulty, width, and precision. (RL)