The Phonology and Morphology of Reduplication investigates how precedence information is encoded and manipulated in morphophonological representations. Explicit precedence information is introduced to phonological representations and shown to provide insight into reduplication and affixation. Modular analyses of reduplication, including backcopying effects, are presented for Malay, Chaha and Akan. These analyses argue against claims of parallel computation in phonology made by Optimality Theory. Morphological aspects of reduplication are investigated through case studies of Nancowry, Indonesian, Tohono Oodham and other languages. The resulting model of reduplication provides a deeper understanding of reduplication than all other proposals because reduplication is derived from language universal principles.