Really, if you by Behrens' results, your kid doesn't need to spend more than a single day in a program to have the same results as a kid who finishes it. My question then becomes why send your kid at all? If they get full benefit in one day then they surely shouldn't spend any more than that.
This study may have been believable if there were a control group and a follow up, but, unfortunately, it has neither. Also unfortunately, Aspen presented it as "proof Aspen programs work," when in fact, no such thing is proven at all. That is shameless lying to promote its programs, an issue that even Ed Cons openly admit and discuss on their own websites while advising parents to simply "avoid Aspen Education programs."
Bottom line? This study has no weight, is biased, unreviewed, unpublished, no control group and no follow up. Despite these massive failures, Aspen holds it out as proof the programs in it "help kids," even though those same programs have been formally charged with abuse, killed children via abuse/neglect and were shut down by authorities for systemic child abuse.
All these facts add up and are reflected in Aspen Education's sliding income and worsening care standards, according to those in the business of referring kids to programs. Parents would do well to simply avoid Aspen programs as many are now suggesting - even people who make fees for sending kids to Aspen.