Over the next year, some new contributions, provided by a number of ongoing (or recently finished) European project on the calculation and law, received, discussed and reviewed to complete the survey. This book presents 20 thoroughly revised papers referee on hot topics in research in different EU projects: legislative XML, legal ontology, web search, semantics and meta-search engines, web services, system architecture, system of dialectics, dialogue games, multi- -agent system (MAS), legal argumentation, legal reasoning, e-justice, and dispute resolution online. Papers were arranged in topical sections on knowledge representation, ontologies and XML legislative drafting; knowledge representation, legal ontologies and information retrieval; argumentation and legal reasoning, dispute resolution and online, normative and multi-agent systems.