By Jack Jennings
"American tourists are often amused when traveling on the London "tube" to hear the announcement at each station to "mind the gap." This attention-getting advice is meant to warn passengers exiting the subway car to step over the space between the car and the platform.
"American education has its own gap, and it might be helpful if we repeatedly heard public announcements to "mind" it. This gap is the distance between what policymakers are putting in place and what research has found.
"Why have politicians and others decided to ignore the research and use defective systems to make major decisions about retaining teachers or determining their pay? Why are we not "minding the gap"?