Supporting multi-criteria decisions based on a hierarchical structure by taking advantage of acquired knowledge

► In this work we propose a structured approach to help the Decision Maker to find the most suitable alternative for him. ► The suggested algorithm uses a knowledge acquisition technique to help in defining and discovering the Decision Maker's preferences and criteria. ► The suggested algorithm is used to design a product search assistant. ► The assistant's goal is to give support to a consumer when he searches products into an e-marketplace. ► The assistant has been integrated into a multi-agent architecture developed to give support to an e-marketplace.