The Portuguese Association for Artificial Intelligence has
been organizing Portuguese Conferences on Artificial
Intelligence, now held every second year, since 1985.
This volume contains selected papers from the Fifth
Conference on Artificial Intelligence. The conference has an
international status: 62 contributions from 13 countries
were received, of which 26 were from Portugal. To guarantee
a high scientific standard, all the contributions were
reviewed by at least three researchers,and only 20 papers
were accepted and included in these proceedings. The papers
are organized into sections on constraints, search,
knowledge representation, temporal reasoning, planning,
diagnosis and repair, and learning.