This would be my favorite quote of 2007, except it is from a 2000 paper. Says an unnamed official in the Japanese Ministry of Education:
We change the Course of Study about every ten years. But the truth is that ten years is too short a time to change classroom education. If we greatly changed the Course of Study every ten years, teachers would be turning their heads this way and that so often that their necks would break. So we make major changes in the Course of Study only every twenty years or so, and in between it's just fine tuning.