Learning to read is one of the most important indicators of academic achievement. The development of early literacy skills during the preschool years is associated with improved reading outcomes in later grades. One of these skill areas,phonological awareness, shows particular importance because of its strong link to later reading success. Presented here are two studies that describe the development and revision of four measures of phonological awareness skills: Individual Growth and Development Indicators Sound Blending, Syllable Sameness, Rhyming, and Alliteration 2.0. The authors discuss the measure development process, revision, and utility within an early childhood Response to Intervention framework. [This article was published in "Journal of Learning Disabilities," (EJ1070909).]