Milwaukee Journal-Sentinel Editorial:

A proposal to standardize the way states calculate high school graduation rates makes sense.
A report earlier this month examining America’s 50 largest school districts found that Milwaukee Public Schools had a graduation rate of only 46.1%. The report by America’s Promise Alliance, an advocacy group, reported that Detroit was at the bottom of that list with a graduation rate of 24.9%.
Wait a minute, MPS officials countered. Our graduation rate is 66%.
Who’s right?
Both probably are. That’s the problem U.S. Education Secretary Margaret Spellings hopes to solve by changing some of the rules under the No Child Left Behind Act, which Congress is considering reauthorizing.
Under the proposal, states would be required to use a uniform method of calculating high school graduation rates by the 2012-’13 school year. As it stands now, comparing graduation rates is difficult. Under the proposal, only students who complete school on time with a regular degree can be counted as graduates. Students who take longer than four years or who earn an alternative diploma, such as a GED certificate, would not be counted.