http://www.loria.fr/projets/JEP/JEP2002/papiers/47.pdfWe present a formal computerized model of a particular linguistic theory, functional phonology -- a theory which is often criticized precisely for its lack of formalization. This theory proposes on the one hand a general framework for the expression of phonological phenomena and on the other a model for a discovery procedure for phonological units. In formalizing this theory explicitly, we have arrived at (1) a formalism for the expression of data and hypotheses and (2) a computer program emulating the functionalist methods of phonological analysis.In the paper, we present the principal data structures used and the procedures which we have designed to process them. Methodological obstacl...