But already, a trial in Scottish schools has found that a rival system for teaching children to read seems to produce better results than the government's.
When trying to find out if something will work - be it a new policy, a new drug, a new teaching method - the gold standard of evidence is what comes out of a properly conducted random controlled trial.
Cognitive behavioral therapy that focuses on teaching practical skills that help people get through crisis moments was shown to reduce suicide attempts by half in big 2005 trial on civilians.