Recognizing that a capacity to innovate and commercialize new high-technology products is increasingly a key for the economic growth in the environment of tighter environmental and resource constraints, governments around the world have taken active steps to strengthen their national innovation systems.> The National Research Council's Board on Science, Technology, and Economic Policy (STEP) has embarked on a study of selected foreign innovation programs in comparison with major U.S. programs. The "21st Century Innovation Systems for the United States and Japan: Lessons from a Decade of Change" symposium reviewed government programs and initiatives to support the development of small- and medium-sized enterprises, government-university- industry collaboration and consortia, and the impact of the intellectual property regime on innovation. This book brings together the papers presented at the conference and provides a historical context of the issues discussed at the symposium.