Mario Pérez-Montoro holds a PhD in Philosophy and Education from the University of Barcelona (Spain) and a Master in Information Management and Systems from the Polytechnic University of Catalonia (Spain). He studied at the Istituto di Discipline della Comunicazione at the Università di Bologna (Italy) and has been a Visiting Scholar at the Center for the Study of Language and Information (CSLI) at Stanford University (California, USA) and at the School of Information at UC Berkeley (California, USA). He is a Professor in the Department of Information Science at the University of Barcelona (Spain). His work has focused on information architecture and visualization. Lluís Codina holds a PhD in Information Science from Autonomous University of Barcelona. He is a Professor at the Universitat Pompeu Fabra in Barcelona. He teaches in the School of Communication at Journalism and Communication Studies and the Master's Degree in Social Communication (MUCS) Department of Communication. He is the coordinator of the Digital Documentation and Interactive Communication Group of the Pompeu Fabra University. His research work is focused in digital and interactive information systems.