The difficulty, as evidenced by several studies, is sustaining early progress through the middle years of primary and on to secondary. Many pupils now at the upper end of primary missed the benefits of the revamped strategy and teachers' renewed commitment and continue to struggle with reading. Many secondaries in August will find pupils at levels A or B and unable to access the curriculum.
Within a few years, every pupil will have had the advantage of early intervention. The test will be whether illiteracy is eliminated. That would be an achievement.