Carol A. Poppe received her B.A. degree from Ohio University and has taken several graduate courses at Oakland University and Siena Heights College. Mrs. Poppe has 25 years of teaching experience at the first- and second-grade levels. She and her husband, Michael, enjoy camping and have traveled to most of the states and Canadian provinces. She has three daughters, Nancy, Molly, and Jenny, who live in Michigan, Ohio, and Tennessee, respectively. Nancy A. Van Matre, who received her B.A. degree and M.A. degree in Reading from Eastern Michigan University, has been actively teaching grades 1 through 3 since 1975. She resides in Ann Arbor with her husband, Bruce Miller, and their two sons, Nick and Jason. During the past fifteen years, the authors have used their learning centers as an integral part of their classroom schedules at Clinton (Michigan) Community School. After presenting workshops, they realized that other educators wanted to begin a learning center system, but needed management techniques, leaning center activity ideas, and shortcuts. In an effort to help other educators, the authors have also written Science Learning Centers for the Primary Grades (1985), K-3 Science Activities Kit (1988), and Social Studies Learning Centers for the Primary Grades (1989), each published by The Center for Applied Research in Education.