Developed by Filament Games, Scholastic W.O.R.D. is a reading and vocabulary program for early learners in K-5. W.O.R.D. is grounded in the research of Dr. Elfrieda Hiebert, who discovered and cataloged the 2,500 high-utility word families that make up 90% of all texts. Through games and written passages, students independently progress within a game-based, guided program in which they receive repeated exposure to those high-utility words and their meanings in multiple contexts. The content in W.O.R.D. is organized by grade level and thematic modules with associated word lists. Each module beginning with a placement test to personalize the path of each student. This ensures that students are introduced to the same vocabulary, but at the appropriate text level, creating a zone of proximal development for learning.