In this paper we present how knowledge capitalized using the Knowledge Management Mask methodology can be used to design E-Learning activities by matching Mask models and the concepts proposed by the IMS-Learning Design modelling language. Our study consists in highlighting the E-Learning aspects encapsulated in these MASK models carried out around a domain of activity, via a writing these elements in the description language IMS - Learning Design, in a preoccupation of reusability and reengineering.