In this project, the team will develop a prototype of a web-based coding progression tool for high school students to practice coding from easy to successively harder levels. The prototype will provide graded practice exercises, solutions, and explanations for important coding tasks. At the end of Phase I, in a pilot study in five high school classrooms, the researchers will examine whether the prototype functions as planned, whether teachers believe that the full product concept could be implemented, and if the prototype shows promise for improving student outcomes in coding and computer science.