Throughout its history, the hope has always been cherished that typology is holistic, and holism entails that there is systematic co-variation not only within levels or modules of grammar but also between them. Accordingly, numerous claims have been made that phonology does not vary across languages independently of morphology and syntax, and vice versa. The variables that are allegedly interrelated pertain to segment inventories, the shapes of syllables, morphemes, and words, phonological or morphonological rules, tones and accents, and rhythmic or prosodic patterns on the one hand and to analytic or (poly-)synthetic grammar, Separatist or cumulative morphological exponence, the complexity of grammatical units, and their linear order on the other. These claims are cataloguedin thispaper. To substantiate them and to accommodate those that are found valid in theories of the Interface between phonology, morphology, and syntax remain äs tasks for the future.
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