This article handles the problem of the automatic analysis of online hand drawn geometric sketches. An online sketch can be analyzed according to several points of view. As for offline sketching, we can try to recognize the produced shape. However, online sketching allows other levels of analysis like the one of the drawer’s behavior during the production of sketches. We propose a method for drawer’s behavior extraction and modelling. Then we show how we can determine the favorite procedure of a drawer and how procedural noise can disturb the study of the procedural consistency of drawers’ behaviors.