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Reduplication is the phonological repetition of segmental material triggered by a morphological source. This definition captures the core aspects of this linguistic phenomenon and distinguishes it from other phenomena that cause the surface repetition of phonological material. This chapter provides a synthesis of questions about reduplication based on classic and contemporary models of reduplication. The most important questions about reduplication can be summarized as the strong hypothesis for reduplication (SHR). (1) The strong hypothesis for reduplication a. Architectural modularity There is a morphology module that is distinct and prior to a phonology module. Both modules have internal structure. b. Bipartite reduplication The morphology module creates a reduplicated structure, but segmental copying occurs later in the phonology module. c. Identity is synchrony The source of identity effects in reduplicated forms is the fact that the repeated segments in the output are a single synchronous representation prior to copying. After copying has occurred, the repeated segments are distinct representations and can diverge in identity on the basis of the general application of phonological rules. The proposed answers to these questions identified by the SHR demonstrate that reduplication informs us about grammatical architecture in general, the relation between the morphology ... log in or subscribe to read full text