Exponence refers to the mapping of morphosyntactic structure to phonological representations, a research area which is not only highly controversial, but also approached in fundamentally different ways in theoretical morphology and phonology. This volume brings together leading specialists from morphosyntax and morphophonology. The authors address common problems, questions and solutions in both areas, and formulate a coherent research program for exponence which integrates the central insights of the last decades and provides important new challenges for the future.