This CD-ROM contains the proceedings of the fourth international conference on research reactors, convened to promote the exchange of information on research reactor issues and trends among users, operators, regulators, designers and suppliers. The conference included more than 120 oral and poster presentations pertaining to six technical areas of research reactors: utilization and applications; operation and maintenance; new research reactor projects; safety; spent fuel, waste and decommissioning; and reactor designers and providers. The information provided on this CD-ROM will serve as a reference for today’s international research reactor community in terms of its achievements, issues and challenges to date, as well as future trends and anticipated developments.