This book collects the scientific papers presented at the
2nd Congress of the Italian Association for Artificial
Intelligence, held in Palermo in October 1991. It displays
the state of the art of both Italian and European scientific
research in AI. The book begins with an invited paper by W.
Wahlster et al. The bulk of the book is then divided into
five parts on: - Knowledge representation (18 papers), -
Knowledge acquisition (5 papers), - Natural language (5
papers), - Perception and robotics (5 papers), -
Architecture and technologies (5 papers). A section
containing short papers completes the book. The high quality
of the papers reflects massive research activity mainly
devoted to the theoretical aspects of AI, but clearly aimed
at consolidating the results already achieved. Several
contributions are oriented to the technological aspects of
AI.