Nine conditions that may be placed on acquisitional models are that they must: (i) specify their domain, (2) demonstrate applicability across language types, (3) represent only the information actually available to the child~ (4) include inputs and outputs in a proportion corresponding to their observed proportions, (5) include inputs and outputs in a sequence corresponding to their observed sequence, (6) make plausible assumptions regarding psychological processes, (7) make testable

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... regarding psychological processes, (8) give evidence for the learnability of the proposed grammar, and (9) demonstrate the ability of the system to generate the output. A model is presented that attempts to satisfy these nine conditions for one area of linguistic development--the acquisition of morphophonology. The functioning of the model is sketched in terms of a dialectic cycle for the processes of application, monitoring, and acquisition. The system of application is based on a competition between rote, analogy, and combination. The discussion notes ways in which the model addresses each of the nine conditions noted above.