Microadjustments to the current system are insufficient
effective implementation cannot be done by making microadjustments to the current system. We cannot, for instance, install project-based learning as a new layer on top of the standard instructional approaches we have. We cannot squeeze real teacher development into three annual inservice days and a monthly faculty meeting. Each of the strategies requires us to rethink and redesign the whole system from the ground up and build it collaboratively.
And all of this has to take place while we continue to teach kids and continue to feel the relentless pressure from outside our walls for unfaltering and ever-increasing improvement. The risk associated with those foundational changes increases every year, and most schools have not been able (or willing) to risk the possibility of the unknown. When given the choice between something that has been at least moderately successful (the status quo) and something with no guarantees for improvement, we choose the safe route.
Gerald Aungst via http://connectedprincipals.com/archives/6648