Successful technology integration, however, relies on intelligent planning. Teachers must understand those variables they cannot control — students’ readiness, interest, and learning profile. Planning should begin by acknowledging those variables and understanding the learning goals. The selection of technology follows as a natural result, as teachers select appropriate tools for manipulating those variables they can control — content, process, product, and environment. Differentiated instruction designed with these principles in mind ensures classrooms that are rich centers of learning for all students.