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.