This book constitutes the thoroughly refereed proceedings of the 7th International Workshop on Multi-Agent-Based Simulation, MABS 2006, held in Hakodate, Japan, May 8, 2006 as an associated event of AAMAS 2006, the main international conference on autonomous agents and multi-agent systems.

The 12 revised full papers presented together with 3 short papers and 2 invited papers were carefully reviewed and selected from 25 submissions during two rounds of reviewing and improvement. The papers are organized in topical sections on Empirical Cross Studies, Experimental Ecology, Experimental Economics, Foundations and Methodologies, Learning and Social Dependence.