References

Meets WWC evidence standards

Preschool Curriculum Evaluation Research (PCER) Consortium. (2008). Doors to Discovery and Let’s Begin with the Letter People. In Effects of preschool curriculum programs on school readiness (pp. 85–98). Washington, DC: National Center for Education Research, Institute of Education Sciences, U.S. Department of Education.

Meets WWC evidence standards with reservations

Christie, J., Roskos, K., Vukelich, C., & Han, M. (2003, June). The effects of a well-designed literacy program on young children’s language and literacy development. In F. Lamb-Parker, J. Hagen, R. Robinson, & H. Rhee (Eds.), The first eight years—pathways to the future: Implications for research, policy, and practice (pp. 447–448). Proceedings of the Head Start National Research Conference. New York: Mailman School of Public Health, Columbia University.

Studies that fall outside the Early Childhood Education protocol or do not meet WWC evidence standards

Assel, M., Landry, S., Swank, P., & Gunnewig, S. (2007). An evaluation of curriculum, setting, and mentoring on the performance of children enrolled in pre-kindergarten. Reading and Writing, 20(5), 463–494. The study does not meet WWC evidence standards because the overall attrition rate exceeds WWC standards for this area.

Han, M., Roskos, K., Christie, J., Mandzuk, S., & Vukelich, C. (2005). Learning words: Large group time as a vocabulary development opportunity. Journal of Research in Childhood Education, 19(4). The study does not meet WWC evidence standards because it only includes outcomes that are overaligned with the intervention or measured in a way that is inconsistent with the protocol.¹³

Roskos, K., Ergul, C., Bryan, T., Burstein, K., Christie, J., & Han, M. (2008). Who’s learning what words and how fast? Preschoolers’ vocabulary growth in an early literacy program. Journal of Research in Childhood Education, 22(3), 275–290. The study is ineligible for review because it does not use a comparison group.

Wahlstrom, K., Hornbacher, J., & Rader, S. (2007). Bloomington/Richfield—Early Reading First Get Ready Centers of Excellence year II report. Minneapolis, MN: Center for Applied Research and Educational Improvement. The study does not meet WWC evidence standards because the intervention and comparison groups are not shown to be equivalent at baseline.