Interlock is a multi-level program designed for families with kindergarten and/or preschool children. Interlock has been formulated for the new home educator. It provides detailed instruction in each lesson while equipping the teacher with presentation techniques. Scripturally, Interlock covers Genesis 1-10. It teaches thematic applied Creation in chronological order. As each aspect of Creation is studied biblically, the application is made to the physical, created world. Interlock establishes a foundation of Scripture while integrating the subjects of Social Studies, Science, Language Arts, Arithmetic, Art, Physical Education, Health, Memory Work, and Music. The Interlock program includes the Interlock notebook and a music tape.