ABSTRACT. As Kempen puts it, grammar instruction cannot restrict itself to conveying grammatical insights to the students. Perrier builds the grammar with the XMG tool, which allows grammars to be written with a high level of abstraction in a modular setting and to be compiled into low level grammars, usable by NLP systems. Blache et al. present an experiment based on a constraint-based linguistic formalism consisting in developing a broad-coverage grammar by means of corpus-based techniques.