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Morphotactics and allomorphy are usually modeled in different components, leading to interface problems. To describe both uniformly, we define finite automata (FA) for allomorphy in the same feature description language used for morphotactics. Nonphonologically conditioned allomorphy is problematic in FA models but submits readily to treatment in a uniform formalism.

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Claims concerning the maintainability of object oriented software usually refer to encapsulation and inheritance mechanisms. However, if objects are perceived only from the code level, potentials for higher level maintenance operations are missed. Moreover, classical maintenance focussing just on code destroys the relationship that once existed between specification and implementation.We present service channels as mechanisms to support maintenance requests on the specification and, for a substantial class of requests, the propagation to the implementation keeping the relationships between specification and implementation consistent.