Evaluating a Professional Development Program and Third-Grade Reading Achievement Outcomes in the Context of Colorado’s Read Act

We investigated whether Language Essentials for Teachers of Reading and Spelling: 3rd Edition (LETRS) was related to student reading ability by comparing the average third-grade reading achievement of schools that used LETRS to that of schools that used exclusively other professional development experiences in the context of Colorado’s Read Act. Guided by What Works Clearinghouse Standards, we conducted a quasiexperiment with propensity score matching and an active comparison group. We supplemented our primary intent-to-treat analysis with three sensitivity analyses designed to demonstrate the robustness of our claims. Effect estimates for completing a LETRS volume on educator knowledge ranged from 0.82 to 0.94. Students’ third-grade reading achievement did not statistically differ for schools that adopted LETRS compared with other professional development experiences in any model, suggesting that LETRS was comparable to the other programs at improving third-grade reading achievement at the school level.