Evidence suggests that cooperation among scientists is a growing and important factor determining the productivity of research. The longitudinal data needed for a comprehensive understanding of this trend and its implications, however, are only just becoming available. This grant funds research by a team composed of economist Paula Stephan, econometrician Jacques Mairesse and engineer Lee Fleming to study the model dynamics and productivity of scientific teams. Funds will support data collection and analysis, along with a major conference to discuss research findings and examine the implications for science policy.