Co-teaching has become a popular concept in the field of education, especially as related to special education. Students with exceptionalities in co-taught classes have been found to improve in academics, behavior, social skills, and self-esteem as compared to those taught solely in a special education classroom. There are five main forms of co-teaching: lead and support, station teaching, parallel teaching, alternative teaching, and team teaching. As with any teaching technique, there are pros and cons to each. A description of the forms, the pros and the cons of co-teaching, and its effectiveness in the science classroom will be examined. While these forms of co-teaching can be used in a variety of ways, in these examples the two instructors are a special education and a regular education teacher. In their study, the authors have collected data for three years to demonstrate the effectiveness and ineffectiveness of co-teaching in the science classroom. (Contains 1 figure and 6 resources.)