This book constitutes the thoroughly refereed post-proceedings of the Second International Workshop on Formal Approaches to Agent-Based Systems, FAABS 2002, held in Greenbelt, MD, in October 2002. The 18 revised full papers and 5 poster papers presented together with 9 panel statements and summaries were carefully selected for presentation during two rounds of reviewing and improvement. Among the topics addressed are formal models for agent communication, communication protocols, logic-based agents, statechart frameworks, formal specification of agent interaction, space shuttle applications, automated satellite ground operations, formal verification, agent control, multi-agent coordination, agent languages, mobile agent testing, battlefield agents, XML, autonomous agents, etc.