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The man-machine communication by sketching is one of the simplest possibilities. So the sketching process is analysed and experiments were submited to define the main characteristics of this processes for the CAD systems. The computer has to compare the sketched and already known signals, establish the equivalence and generate a symbol, a word and then a command. The filtering of signals has to be performed because of different designers (designing) qualities. The sketching processes, identification and recognition of plane signals especially letters, numbers and their components as circles and lines are defined as sketch elements (countour, extension line, central line, dimension line, sign, hatching, etc.). The analysis of hand moving, filtering of signals and the dimensioning of extremities is presented. (An englisch translation of the article is in the same number). (Jarc)