The current volume includes the research results presented at the Fifth International Conference on Intelligent Decision Technologies (KES-IDT 2013) which took place in June 26-28, 2013, in Sesimbra, Portugal.

KES-IDT is a well established international annual conference, interdisciplinary conference in nature, and this edition consisted of keynote talks, oral and poster presentations, invited sessions and workshops, on the applications and theory of intelligent decision systems and related areas. It provided excellent opportunities for the presentation of interesting new research results and discussion about them, leading to knowledge transfer and generation of new ideas.

Sesimbra is a municipality lying at the foothills of the Serra da Arrábida, a mountain range between 40 km to the South of Portugal's capital, Lisbon. To the East of Sesimbra lies Arrábida Natural Park with natural caves, beaches and beautiful trails. To the West you'll find more beaches as well as Cabo Espichel with its scenic hiking trails, dinosaur footprints and ancient monastery. To the South lies Praia California and the Atlantic Ocean. Sesimbra is sheltered and the climate here is typically warmer than in most areas along the coast.

KES-IDT 2013 received many high quality submissions and all papers have been reviewed by at least two reviewers. Following a rigorous reviewing process, not all submissions could be accommodated for presentation at the conference. From these, 45 papers were accepted for presentation and included in this Proceedings. We are very satisfied with the quality of the program and would like to thank the authors for choosing KES-IDT as the forum for presentation of their work. Also, we gratefully acknowledge the hard work of KES-IDT international program committee members and of the additional reviewers for taking the time to review the submitted papers rigorously and select the best among them for presentation at the conference and inclusion in its proceedings.

We are also grateful to the KES personnel for their wonderful work in maintaining the KES-IDT 2013 website. Finally, we would like to thank the IOS Press personnel for their wonderful job in producing this volume.

The General and Program Co-Chairs:

Rui Neves Silva, Universidade Nova de Lisboa, Portugal

Gloria Wren-Phillips, Loyola University, USA

Junzo Watada, Waseda University, Japan

Lakhmi C. Jain, University of South Australia, Australia

The Executive Chair:

Robert Howlett, KES International & Bournemouth University, UK

The Local Arrangements Chair:

Ana Rita Campos, UNINOVA, Portugal