This book constitutes the thoroughly refereed proceedings of the 30th Annual German Conference on Artificial Intelligence, KI 2007, held in Osnabruck, Germany, September 10-13, 2007.

The 26 revised full papers presented together with 6 invited contributions and 21 posters were carefully reviewed and selected from 81 submissions. The papers are organized in topical sections on cognition and emotion, semantic Web, analogy, natural language, reasoning, ontologies, spatio-temporal reasoning, machine learning, spatial reasoning, robot learning, classical AI problems, and agents.