“To make effective differentiation a reality, new partnerships are needed among specialists and generalists. These partnerships do not happen easily. The culture of teaching is characterized by isolation. We often do not know how to talk to one another, how to solve problems together, or how to share turf. No classroom teacher can have specialized knowledge that benefits every type of student….Likewise, no specialist can fully know all areas of curriculum. Classroom teacher- specialist collaborations are essential” (Tomlinson & Allan, 2000, p. 60).