Looping, a multi-year teaching assignment whereby a teacher remains with the same group of children for more than one grade, is designed to meet the individual needs of students and improve student learning. This booklet describes the practice of looping in American schools. The booklet details the underlying theories supporting the practice and describes why looping is successful. Information is also provided on implementing looping, including developing an interest group, finding a core of teachers, introducing the concept to parents, and targeting students for inclusion in the looping classrooms. Suggestions are given for successful implementation and warding off potential difficulties. The booklet concludes by noting that the practice of looping is increasing as one of the many options with immense benefits to students. (Five appendices include sample surveys for teachers and students and sample letters for parents. Contains 14 resources.) (KB)