by Elfrieda H. Hiebert 
image credit: Adobe Stock
May was a productive month for TextProject with the publication of two studies that have been a long time in development and refinement. The studies examined students at two points in the developing reading period: first graders and second graders, but both show how relatively small differences in vocabulary demands can substantially affect students’ success.
Together, these studies suggest an important shift in thinking about beginning reading instruction. “Reading level” alone does not tell us enough about how difficult a text will be for students. The familiarity, frequency, and spelling patterns matter greatly.
Research Summaries
The first study showed that first graders performed very differently on texts assigned the same grade level but varying in vocabulary difficulty. Vocabulary complexity significantly affected students’ accuracy, fluency, and comprehension, with the strongest effects on students who were still developing automatic word recognition.
Download full text of article (PDF): The Role of Text Vocabulary in Word Recognition, Reading Rate, and Comprehension of First-Grade Students
Citation
Bruner, L., Hiebert, E. H., & Tortorelli, L. S. (2026). The role of text vocabulary in word recognition, reading rate, and comprehension of first-grade students. Reading and Writing, 1-24.
The second study considered the particular word features that predicted the difficulty of words read in texts by second graders. Especially influential were vowel patterns (such as r-controlled vowels and diphthongs), word frequency, and age of acquisition.
Dowload full text of article (PDF): Word-Features Influencing Second Graders’ Word Recognition in Connected Texts: Secondary Analysis of Oral Reading Fluency Data Using Explanatory Item-Response Models
Citation
Toyama, Y., Hiebert, E. H., Irey, R., & Qing, C. (2026). Word‐Features Influencing Second Graders’ Word Recognition in Connected Texts: Secondary Analysis of Oral Reading Fluency Data Using Explanatory Item‐Response Models. Journal of Educational Measurement, 63(2), e70040.
Classroom Applications
- Look beyond leveling systems when selecting texts and attend to the features of the words in the text.
- Give students repeated exposure to important vocabulary across many texts.
- Pay careful attention to challenging vowel patterns, especially r-controlled vowels and diphthongs.
- Ensure that struggling readers encounter enough familiar vocabulary to support successful reading.
- Most importantly, these studies remind us that careful attention to vocabulary and word features can make texts substantially more accessible for beginning readers.