Artificial Intelligence (“AI”) and law is a subfield of artificial intelligence which is mainly concerned with the application of AI to the problems of legal informatics and original research on those problems. It is also concerned with contributing in the other direction: to export tools and techniques developed in the context of legal problems to AI in general. For instance, theories of legal decision making, especially models of argumentation, have contributed to knowledge representation and reasoning; models of social organisation based on norms have contributed to multi-agent systems; reasoning with legal cases has contributed to case-based reasoning, and the need to store and retrieve large amounts of textual data has resulted in contributions to conceptual information retrieval and intelligent databases.