I have been a historian of American education since 1975, when I received my doctorate from Columbia. I have written histories, and I've also written extensively about the need to improve students' knowledge of history, literature, geography, science, civics and foreign languages. So in 1991, when Lamar Alexander and David Kearns invited me to become assistant secretary of education in the administration of George H.W. Bush, I jumped at the chance with the hope that I might promote voluntary state and national standards in these subjects.

I became a founding board member of the Thomas B. Fordham Foundation and a founding member of the Koret Task Force at the Hoover Institution, both of which are fervent proponents of choice and accountability. The Koret group includes some of the nation's best-known conservative scholars of choice, including John Chubb, Terry Moe, Caroline Hoxby and Paul Peterson.

As No Child Left Behind's (NCLB) accountability regime took over the nation's schools under President George W. Bush and more and more charter schools were launched, I supported these initiatives. But over time, I became disillusioned with the strategies that once seemed so promising. I no longer believe that either approach will produce the quantum improvement in American education that we all hope for.

NCLB received overwhelming bipartisan support when it was signed into law by President Bush in 2002. The law requires that schools test all students every year in grades three through eight, and report their scores separately by race, ethnicity, low-income status, disability status and limited-English proficiency. NCLB mandated that 100% of students would reach proficiency in reading and math by 2014, as measured by tests given in each state.