Preface Trading agents are a prominent area of research in artificial intelligent and multiagent systems. e design and analysis of trading agents poses significant challenges in decisionmaking and many different artificial intelligence (AI) techniques have been combined in the study of trading agents (such as planning, decision theory, game theory, machine learning or optimization). In addition to research interest, trading agents have potential benefits in electronic commerce, supply chain management and other business interests. e workshop on Trading Agent Design and Analysis focuses on all aspects of the design and evaluation of trading agents, including agent architectures, decision-making algorithms, theoretic analysis of agents or market games, empirical studies of agent performance, agent negotiation strategies, game-theoretic studies, market architectures and other related topics. e Trading Agent Design and Analysis workshop has a long and successful history (since 2003) being co-located at different artificial intelligence conferences. Additionally, the workshop traditionally coincides with the final rounds of the Trading Agent Competition. e Trading Agent Competition finals are also used as a way to promote research on trading agents to a broader audience and to generate interest in new application areas for agent technologies. For example, the latest trading agent competition scenario focusing on energy markets (Power TAC) is generating significant interest within the community. is is as well confirmed by the fact that Power TAC is the single most common topic among papers accepted to the Trading Agent Design and Analysis workshop. Other Trading Agent Competition scenarios include ad auctions and supply chain management. Vedran Podobnik Workshop Chair vii