The lexical CALL programs of Didascalia comprise a major part of our R&D over the past ten years. After a critical look at the subdivision in qualitative generations of software, the prin-ciple of external versatility is explained as the internal adaptability of a program to external criteria. This adaptability is achieved through a selection system of contents and strategies within a multiple environment model. Other didactic aspects are finally discussed, such as the creation of tailor-made menus, the systematisation of lexical progression, the use of translation, and the embedding of words into semantic reply-forms with a high learning impact, as a middle course between an atomised approach and a whole-language approach.
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