Indeed, Head Start did work well in several pilot programs carefully run by professionals in the 1960s. And so it was "taken to scale," as the wonks say, as part of Lyndon Johnson's War on Poverty.
It is now 45 years later. We spend more than $7 billion providing Head Start to nearly 1 million children each year. And finally there is indisputable evidence about the program's effectiveness, provided by the Department of Health and Human Services: Head Start simply does not work.
According to the Head Start Impact Study, which was quite comprehensive, the positive effects of the program were minimal and vanished by the end of first grade. Head Start graduates performed about the same as students of similar income and social status who were not part of the program. These results were so shocking that the HHS team sat on them for several years, according to Russ Whitehurst of the Brookings Institution, who said, "I guess they were trying to rerun the data to see if they could come up with anything positive. They couldn't."