Morgan Loew, a reporter for CBS in Phoenix, investigated the BASIS charter schools, which have regularly been ranked by U.S News as one of the best high schools in the nation.

Parents at the school are very happy with their children’s progress.

Critics say that the attrition rate is so high that the school ends up with only the best students.

BASIS officials dispute that claim.

Statistics tell a different story.

But statistics from the U.S. Department of Education show a large drop-off in student enrollment from middle school to high school.

During the 2012 to 2013 school year, BASIS Scottsdale had 144 students in the sixth grade, but only 32 in the 12th grade. Other BASIS schools show a similar pattern.

“Those nine to 20 to 50 12th graders at some of our newer schools didn’t start with classes of 100 kids. They started with classes of 20 kids or 30 kids,” said Peter Bezanson, the CEO of BASIS schools.

He said the schools are gaining enrollment in the lower grades, which should translate into larger graduating classes. Bezanson argues that actual drop-off is roughly 10 percent per grade, except between the eighth and ninth grades, where the attrition rate is 25 percent.

“We don’t like that. We’re working to, we want to keep all those kids,” Bezanson said.

But critics say there is a problem with the way political leaders and policymakers view BASIS and compare it to other schools.

“You can’t compare it to the other schools around,” said Amanda Potterton, a PhD student at Arizona State University. She has studied BASIS and the makeup of its student body. She said BASIS has few students who live in poverty and few students with special needs.

“The data show the ones who stay are going to perform well on tests no matter where they go to school,” Potterton said.

She and others argue that the school system’s ranking is inflated because it teaches only the brightest, most motivated students, while traditional schools teach students from a variety of backgrounds and with a variety of problems.

“I don’t think we should be touting a school that graduates a couple of handfuls of kids as somehow superior to these schools that graduate hundreds of kids with many different challenges,” Erfle said.

But there is a large demand for seats at BASIS desks. There is currently a 7,000-student waiting list for this fall.

Meanwhile, BASIS has expanded to other states, including Texas. It plans to open a private school in Brooklyn.

Read more: http://www.kpho.com/story/29731806/basis-schools-fight-criticism-work-to-increase-student-retention#ixzz3i9Zxh3tm