National Benchmarking Analysis of Technology Business Incubator Performance and Practices
The U.S. Department of Commerce Technology Administrations study highlights 17 of the nations top incubators. To determine the 17 "best-in-class" incubators out of a field of 79, National Business Incubation Association researchers gathered data on employment and sales revenue growth from incubator managers.
Link
http://www.technology.gov/reports/TechPolicy/NBIA/2003Report.pdf