Grades 3–5. Investigate and experiment with how a wheel turns an axle and how an axle turns a wheel, with 2 levels of inclined planes, a screw, and a wedge. Build 7 different replicas of real-world models, 1 at a time. Included CD-ROM contains building instructions with real-life photos and key facts for each model. Set supports 2 to 3 students working as a team; Classroom Solution consists of 8 complete sets.