The advantages of differentiated insh·uction compared to traditional direct instruction were contrasted aud compared in this study. The research examined the need for differentiation in public school classrooms with a wide range of student skill aud ability. The focus of the research was to determine whether or not differentiation is a sound and best teaching practice, and to what extent it should be incorporated into national curriculum instruction. The project centered on the creation of a differentiated unit for au eleventh grade U.S. Hist01y class. The unit is designed to accommodate a mixed-ability classroom by using differentiated instruction strategies. The results found that differentiated instruction is indeed a best practice and should be used as often as possible in all grades. However, the implications of practicing differentiation contribute to why differentiation remains controversial and underused