Abstract of Invited Talk (1-hour) at ICAIL-2001 on May 23, 2001 (International Conference on Artificial Intelligence and Law; http://www.cs.wustl.edu/icail2001 ; held Washington University Law School, St. Louis, MO, USA) Title: "Automating Law in the Small: Contracts, Regulations, and Prioritized Argumentation" Prof. Benjamin Grosof Information Technology group and Center for E-Business@MIT MIT Sloan School of Management http://www.mit.edu/~bgrosof (Also, recently the leader of the Business Rules for E-Commerce group at IBM Research.) I discuss applications of rule-based declarative knowledge representation to automating legal agreements and regulations of an everyday character, i.e., "law in the small". I begin by showing how significant portions of contract descriptions can be modularly and iteratively assembled, e.g., during B2B negotiations by XML-speaking agents, and then have their provisions executed automatically directly from those descriptions. I discuss more generally how many regulations and business policies can be treated in like manner, and what advantages are to be gained by this approach. In each of these applications, exploiting the extension of usual rule-based techniques to encompass computationally tractable prioritized default reasoning and argumentation (cf. courteous logic programs) provides significant benefits for human specification/comprehension, and for modularity in automated modification/communication.