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Dealing with unknown words by simple decomposition: feasibility studies with Italian prefixes CARTONI, Bruno In this article, we present an experiment that aims to evaluate the feasibility of a superficial morphological analysis, to analyse unknown constructed neologisms. For any morphosyntactic analyser, lexical incompleteness is a real problem. This lack of information is partly due to lexical creativity, and more especially to the productivity of some morphological processes. We present here a set of word formation rules based on constructional morphology principles that can be used to improve the performance of an Italian morphosyntactic analyser. These rules use only simple computing techniques in order to ensure efficiency because any improvements in coverage must not slow down the entire system. In the second part of this paper, we describe a method for constraining the rules, and an evaluation of these constraints in terms of performance. Great improvements are achieved in reducing the number of incorrect analyses of unknown neologisms (“noise”), although this is at the cost of some increase in “silence ” (correct analyses which are no longer produced). This classic trade-off between “noise ” and “silence”, [...