First Author:   Rim Boussaada University of Jendouba, Université de Tunis, GEF2A lab boussaada.r@gmail.com         Second Author: Aymen Ammari Avicenne private school, THEMA ammariaymen@yahoo.com         Third Author: Nouha Ben Arfa ESTA School of Business and Technology, LAREFI, CEREN nbenarfa@esta-groupe.fr