Henderson calls standardized tests "incredibly important." But she says she'll also look at other markers of success, including enrollment.
"It means families are voting with their feet, and have a level of confidence in the District in our ability to serve their children," she says. "I think we have to look at our attendance rates, which are up slightly. The more we can keep children in school, the better our chances of being successful with them. I think graduation rates are important."
Henderson worked closely with former Chancellor Michelle Rhee and was instrumental in negotiating the new teacher union contract and designing a teacher evaluation system.
Gray says he did not ask his selection panel to consider anyone else, saying he spoke to teachers and parents, observed Henderson at community meetings and "relied heavily" on his own judgment.
Henderson still has to be confirmed by city council members.