Abstract
The present paper presents a data and programmes base used tool, facture and control devices designing: the calibers and countercalibers group. The system was developed using the AutoCAD programming medium. The programmes were conceived in the AutoLISP programming language, generally used for developing applications under AutoCAD. The dialogue elements witch insures the interactivity with the user were made using the DCL language. The drawings obtained by running the programmes and using the existing databases help the designer to obtain the desired item (caliber or conuntercaliber).