I have never understood why we have so much duplicated effort in teaching a standardised syllabus. At the moment (in Australia) each teacher does preparation for a lesson and then gives that lesson. Lots of duplicated effort. So 1000 maths teachers all prepare for the same lesson which introduces fractions, as an example.<p>Instead have a great teacher prepare and then record a presentation. At lesson time every class gets to watch that presentation. This takes up maybe 75% of the lesson time. Then the remainder of the time deals with questions and extra clarification. You just saved a huge number of hours of prep and have a top notch presentation.