The Catalan Association for Artificial Intelligence (ACIA), founded in 1994 as a non-profit association, aims primarily at fostering the cooperation among researchers from the Catalan-speaking Artificial Intelligence research community.

It has been a long way since the first edition of the Catalan Conference of Artificial Intelligence in 1998, held in Tarragona, up until today. By that time, the main goal was to create a forum that allowed communication and research collaboration throughout the Catalan AI community. This objective has been achieved and actually has widened at a constant rate over the last 20 years. The International Conference of the Catalan Association for Artificial Intelligence (CCIA), the conference currently organized by ACIA, is an international event not only for researchers in the Catalan Countries, but also involving researchers from other countries all around the world.

The 20th edition of CCIA is this year held in Deltebre, Terres de l'Ebre, Spain, 25–27 October 2017, under joint organization by the Polytechnic University of Catalonia (UPC, BarcelonaTech) and the University of the Balearic Islands (UIB). A total of 41 original contributions were submitted to CCIA'2017. Of these 41 submissions, 21 were accepted as long papers for oral presentation (10-page papers) and 13 were accepted as short papers to be presented as posters (6-page papers). These 34 submissions appear in this book due to their relevance, originality and technical soundness.

All these papers have been organized around a number of different topics such as Agents and multi-agent systems, Artificial vision and Image processing, Machine learning, Artificial neural networks, Cognitive modelling, Fuzzy logic and reasoning, Robotics, and AI Applications, being not only a representative sample of the current state of the art in the Catalan Artificial Intelligence Community, but also showing the collaboration between the ACIA members and the worldwide AI community.

This volume also includes the abstracts of the invited talks by three outstanding researchers:

• Humberto Bustince, Full Professor in the Department of Automatics and Computation at the Public University of Navarra (UPNA),

• Miquel Domènech, Senior Lecturer in Social Psychology at the Autonomous University of Barcelona (UAB), and

• Alex Rayón, Vicedean for External Affairs and Lifelong Learning at the University of Deusto.

We would like to express our sincere gratitude to the authors of the contributed papers, to the invited speakers for their enlightening talks, to all members of the Program and Organizing Committees who have worked hard to make this conference a success, to Angela Nebot, former scientific Program Chair of CCIA'2016, for her help during this past year, and to Josep Pujol, president of ACIA, for her kind support.

Isabel Aguiló, University of the Balearic Islands (UIB)

René Alquézar, Polytechnic University of Catalonia (UPC)

Cecilio Angulo, Polytechnic University of Catalonia (UPC)

Alberto Ortiz, University of the Balearic Islands (UIB)

Joan Torrens, University of the Balearic Islands (UIB)