Dr. Jose Luis Maté is Full Professor of computer sciences and artificial intelligence at the Universidad Politécnica de Madrid (UPM) and is, at present, Viceprovost of the University. He has also served as Dean of his School of Computer Science. He received his Telecommunications Engineer degree and the PhD from the UPM. His work on information system design is one of his most prominent activities, an area on which he advises several Spanish and international institutions, including the upper and lower houses of the Spanish Parliament. He was a designated member for the Spanish Government in the Spanish Commission for the Y2K. He is author of several books and papers related to the integration of software and knowledge engineering and in the field of learning environments. Dr. Andrés Silva is Lecturer of Software Engineering at Universidad Politécnica de Madrid (UPM), where he is responsible for teaching Requirements Engineering. He has three years of industrial experience in software development and has worked at the Joint Research Centre (JRC) of the European Commission. In 2001 he received his PhD on Computer Science from the UPM. His research interests are Requirements Engineering and Knowledge Management. He is author of several conference and journal papers in requirements engineering.