This paper introduces an novel lexicographic methodology whose goal is the development of a reference syntactic lexicon for French. This methodology proposes to gather and validate both manually and on corpora lexical information coming from the main existing resources, following recent works on three of them. The proposed process relies on a double validation with appropriate user interfaces: on the one hand thanks to lexicographic work by linguists, and on the other hand by the exploitation of automatically parsed textual and dictionary corpora.