Standardized tests. The bane of schoolchildren everywhere...but essential to the debate over which school is doing how well. The latest installment in the data wars over the effectiveness of charter schools says student performance there is pretty much on a par that of students in conventional public schools. That's according to a federal group that works up the nation's report card every year. And it's a rosier assessment than one they released just last month. That one said charter students were underperforming. All of this leaves Americans wondering whether this form of public schooling is working, and worth it. Work and Family correspondent Sarah Gardner has our story.