Each reading level contains four modules which explore topics in physical science, earth and space science, life science, and science and technology, with hands-on activities designed to engage students in the processes of scientific inquiry and technological design. Modules within a developmental level may be taught in any sequence. The handbook can be used with any grade level. Level Pre-K/K has only teacher's ed. ; levels 1-5 have student guide and teacher's ed. Handbook is for use with all levels. Lapbooks are for level Pre-K/K only. Testing materials are for level 1 only.