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Three ways are focused on in which an emergent processing system may diverge from a fully developed one\u2014hypoactivation (too little activation due to underdeveloped links), hyperactivation (too much activation due to overloaded links) and impaired self\u2010inhibition. With a view to determining how children's productions relate to these three \u201cerror mechanisms,\u201d one widespread phonological process, consonant harmony, is subjected to examination. Hypoactivation is found to capture the great majority of harmonic patterns. Hyperactivation and impaired self\u2010inhibition play a more marginal role and are only needed to account for exceptional cases of harmony. The feasibility of the psycholinguistic model is demonstrated with the help of computer simulations that were run with noise on both fully developed and developing networks. 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