Conference Chair
- Sep 2009 - CP’09, 5th International Conference on Principles and Practice of Constraint Programming, Lisbon, Portugal
- Jul 2005 - PPDP’05, Principles and Practice of Declarative Programming, Lisbon, Portugal
- Jun 2001 - AIME’01, 8th Conference on Artificial Intelligence in Medicine Europe, Cascais, Portugal.
- Oct 1991 - EPIA’91, 5th Portuguese Conference on Artificial Intelligence, Albufeira, Portugal.
Programme Chair
- Sep 1999 - EPIA’99, 9th Portuguese Conference on Artificial Intelligence, Évora, Portugal.
- Jun 1995 - AIME'95, 5th Conference on Artificial Intelligence in Medicine Europe, Pavia, Itália.
- May 1994 - MIE'94, 12th Congress of the European Federation of Medical Informatics, Lisboa, Portugal. (Vice-President)
Other Chairs
- Oct 2003 - AIME’03, 9th Conference on Artificial Intelligence in Medicine Europe, Cyprus (Tutorials and Parallel Workshops Chair)
- Oct 1996 - EAIA’96, 5th Advanced School on Artificial Intelligence (Constraint Programming), Estoril, Portugal.
- Dec 2003 - CLPS’03, Workshop on Constraint and Logic Programming Systems, within EPIA’03 Conference), Beja, Portugal.
- Dec 2001- CSOR’01, Workshop on Constraint Satisfaction and Operational Research Techniques for Problem Solving, within EPIA’01 Conference), Porto, Portugal.