With these facts in mind, an experiment was conducted, focused on the addition of a thematic unit of computer aided design (drafting) in 2D and 3D supported by CAD system to the curriculum of grammar schools with a 6- or 8-year study program, for the time period of 6 months. The submitted study presents a summary of contributions and results of the experiment, using the method of investigative research carried out among the teachers of grammar schools with a 6-or 8- study year programs, who had implemented the training of the above mentioned subject.