This book constitutes the proceedings of the 9th International Symposium
on Foundations of Information and Knowledge Systems, FoIKS 2016, held in Linz,
Austria, in March 2016. The 14 revised full papers presented papers were
carefully reviewed and selected from 23 submissions. The papers address various
topics such as reasoning about beliefs, uncertainty, incompleteness, and
inconsistency, inference and problem solving, querying and pattern mining,
dealing with knowledge, logics and complexity.