This monograph is a handbook, consisting of twelve lesson plans based on the inquiry skills, to be used by substitute teachers for science classes. For effective use of the program, materials needed to implement the various lessons must be available and the substitute teachers who will be using these materials must be trained. The objective for each lesson is presented as well as the materials needed and the procedure to be followed. Where deemed necessary, special Teacher Notes are provided to help the substitute teacher maintain student interest and attention and make the lesson a worthwhile learning experience. Lessons presented include such concepts and/or scientific processes as observation, classification, measurement, graphing and mapping. (EB)