This book proposes a new representational analysis of reduplication based on making explicit precedence relations in phonological representations. The main claim is that reduplication results from loops in the precedence structure of phonological representations. Modular rule based analyses of overapplication and underapplication effects including backcopying are presented to argue against the McCarthy and Prince (1995) claim that a derivational model of reduplication is conceptually and empirically inadequate. Other sections of the book discuss the implications of explicit precedence information for the concatenation of morphemes, the analysis of infixation, and templates in reduplication. Analyses of relevant phenomena from Indonesian, Tohono Oodham, Chaha, Chumash and Nancowry among other languages are provided.