This volume contains all the papers that were presented at
the Fourth Workshop on Algorithmic Learning Theory, held in
Tokyo in November 1993. In addition to 3 invited papers, 29
papers were selected from 47 submitted extended abstracts.
The workshop was the fourth in a series of ALT workshops,
whose focus is on theories of machine learning and the
application of such theories to real-world learning
problems. The ALT workshops have been held annually since
1990, sponsored by the Japanese Society for Artificial
Intelligence. The volume is organized into parts on
inductive logic and inference, inductive inference,
approximate learning, query learning, explanation-based
learning, and new learning paradigms.