This paper discusses the target articles by Fikkert, Vihman, and Goldrick and Larson, which address diverse aspects of the acquisition of phonology. These topics are examined using a wide range of tasks and experimental paradigms across different ages. Various levels of processing and representation are thus involved. The main point of the present paper is that such data can be coherently interpreted only within a particular information-processing model that specifies in sufficient detail the different levels of processing and representation. We first present the basic architecture of a model of speech perception and production, justifying it with psycholinguistic and neuropsychological data. We then use this model to interpret data from the target articles relative to the acquisition of phonology.