Abstract : Knowledge Management is a global process in the enterprise. It includes all the processes that allow capitalization, sharing and evolution of the Knowledge Capital of the firm, now recognized as a critical resource of the organization. The strategic objective of Knowledge Management is to understand, support, optimise and accelerate those processes, in coherence and cross-fertilization. Knowledge engineering techniques are often used to capitalize knowledge. These techniques must be adapted and evolved considering the main objectives of knowledge management: building and use organizational memory. We study, in this paper, how the knowledge engineering method MASK (Method for Analysing and Structuring Knowledge) considers this evolution.