A recurrent issue in linguistic theory and psychology concerns the cognitive status of memorized lists and their internal structure. In morphological theory, the collections of inflected forms of a given noun, verb, or adjective into inflectional paradigms are thought to constitute one such type of list. This book focuses on the question of which elements in a paradigm can stand in a relation of partial or total phonological identity. Leading scholars consider inflectional identity from a variety of theoretical perspectives, with an emphasis on both case studies and predictive theories of where syncretism and other "paradigmatic pressures" will occur in natural language. The authors consider phenomena such as allomorphy and syncretism while exploring questions of underlying representations, the formal properties of markedness, and the featural representation of conjugation and declension classes.