This book contains the proceedings of the Second International Workshop on Languages, Methodologies and Development Tools for Multi-agent Systems (LADS 2009), which took place during September 79, 2009 in Turin, Italy. As in its 2007 edition, this workshop was a part of MALLOW, a federation of workshops on Multi-Agent Logics, Languages, and Organizations. The LADS 2009 workshop addressed both theoretical and practical issues related to developing and deploying multi-agent systems. It constituted a rich forum where leading researchers from both academia and industry could share their experiencesonformalapproaches,programminglanguages,methodologies, tools andtechniques supporting the developmentanddeploymentof multi-agent systems.Fromatheoreticalpointofview,LADS2009aimedataddressingissues related to theories, methodologies, models and approaches that are needed to facilitate the development of multi-agent systems ensuring their predictability andveri cation.Formaldeclarativemodelsandapproacheshavethe potentialof o ering solutions for the speci cation and design of multi-agent systems. From a practical point of view, LADS 2009 aimed at stimulating research and d- cussion on how multi-agent system speci cations and designs can be e ectively implemented and tested. This book is the result of a strict selection and review process. From 14 papers originally submitted to LADS 2009, and after 2 rounds of reviews, we selected 10 high-quality papers covering important topics related to multi-agent programming technology, such as: agent architectures, programming languages andmethodologies,socialinteractionmodels,developmenttoolsandapplications of multi-agent systems.
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