Two individuals might experience different things on the same event without a systematic and coherent way of producing knowledge moreover the same individual might not experience the same thing on the same event in two different time points.Experimental way of knowledge production provides a systematic and coherent way of producing scientific knowledge. At the same time it is only one way to test cause-effect relationship.In this book readers will have the opportunity of learning about different types of experimental research and a new design for school-wide experiments.