Although vocabulary plays an important role in literacy and content instruction, there is a paucity of research identifying effective methods for teaching vocabulary. One promising strategy is morphemic analysis, which involves breaking words into morphemes, the smallest meaningful parts of words, and teaching students the meanings of those parts. The current study used a multiple probe across morphemes experimental design to determine the effects of an intervention package, GO FASTER (Graphic Organizers; Flashcards Added up and Self-graphed to Track progress; Errors Reviewed). Findings showed that with three to four instructional sessions, three high school students with high-incidence disabilities successfully defined morphemes at a predetermined fluency rate and generalized these definitions to untaught words. Implications for practice and future research are discussed. (Contains 1 table and 4 figures.)