Earobics Step 1 is a computer-based literacy tutor for children ages 4 to 7 years. Colorful, interactive games with instructional feedback teach phonological awareness (PA), phonological short-term memory, and letter-sound correspondence. Building Blocks is a computer-based mathematics tutor for children in prekindergarten to grade six. Colorful, interactive games with instructional feedback teach spatial and geometric competencies, numeric and quantitative concepts, patterns and functions, classifying, sorting, and sequencing. Both programs are in widespread usage. This project aims to test the efficacy of Earobics Step 1 and Building Blocks and to compare the efficacy of standard implementation of Earobics Step 1 to theoretically motivated variations in instructional sequencing of this program.