The movement toward co-teaching is evolving and expanding in its use. Historically, teachers have managed their own classrooms by working in isolation, setting the rules and making decisions, As a result, the first step in developing a co-teaching partnership is to accept change—the change of sharing a classroom and, more importantly, sharing students with another teacher. Participating in a co-teaching partnership does entail the loss of complete control of the classroom, lesson planning, etc. However, the benefits of these changes can far outweigh whatever might be lost—especially if the co-teachers have a strong partnership. Co-teaching practitioners agree that shared responsibility, trust, parity, flexibility, sharing, and modeling teamwork are essential components for building an effective collaborative relationship.