The purpose of this study is to provide an overview of the extent to which undergraduates attend multiple institutions as well as the relationship between multiple institution attendance and persistence, attainment, and time to degree. Students who attended multiple institutions are the population of interest here. Subsets of this population will also be examined--specifically, those who: (1) Attended two or more institutions at one time (co-enrolled); (2) Transferred between institutions; or (3) Began at a 4-year institution and attended a 2-year institution at some point. This report focuses on both 1995-96 beginning postsecondary students and 1999-2000 bachelor's degree recipients and is organized by survey and beginning institution type. Appended are: (1) Glossary; and (2) Technical Notes and Methodology. (Contains 22 tables and 6 figures.)