This article discusses the waning interests on research-based models. Some experts and program developers say "research proven" programs are getting a smaller and smaller share of the pie under the 7-year-old initiative now called the Comprehensive School Reform program, as schools opt instead for home-grown and commercial programs with weaker research bases. Arthur W. Gosling, the director of the National Clearinghouse for Comprehensive School Reform, said that the numbers may be misleading, though, because some of the models rated as having weak evidence in 1999 have since built up their research bases. Gosling added that several other factors might account for what appears to be a trend away from research-based models. For one, some popular programs may not be able to show they are improving student achievement, because their models have a different focus. They seek to change the processes that go on within schools.