The fourth multidisciplinary workshop on advances in preferences handling had been held on July 13 - 14, 2008 in Chicago, Illinois, in conjunction with AAAI 2008. The workshop organizers had been Jan Chomicki, Vincent Conitzer, Ulrich Junker, and Patrice Perny. The workshop proceedings are available as AAAI Technical Report WS-08-09. Twenty-four papers covered methods for modeling, representation, aggregation, elicitation, learning, and management of preferences and for reasoning and computation with preferences. The papers studied the usage of preferences in computational tasks from decision making, database querying, web search, personalized human-computer interaction, personalized recommender systems, e-commerce, multi-agent systems, game theory, social choice, combinatorial optimization, and planning. The workshop program furthermore included an invited talk about preference elicitation, a panel discussion about preferences and game theory, and a poster session. A report about the workshop is included in the AAAI 2008 Workshop Reports published in AI Magazine,Vol. 30, No 1.