After a short characterization of what an educational modeling language should be, we will deal with the respective interest of two EML proposals : one proposed by OUNL (OUNL/EML and IMS/LD which is derived from it) and one proposed by UNED (PALO). We will then identify reasons that lead us to choose OUNL/EML for experimentation in distance learning education in order to model our scenario. Finally we will present some limitations or extensions we have identified.