They're building that airplane again*

 New York Times article today on the new teacher evaluation systems being put in place around the country has this excellent quote:

States “are racing ahead based on promises made to Washington or local political imperatives that prioritize an unwavering commitment to unproven approaches"

 We don't know if it works BUT we're going to do it, anyway.

*inside reference: the analogy that keeps being made to much of what is being pushed at the national level--teacher evaluation, school "turnaround" systems, Common Core transition--keeps being likened to "building an airplane while you're flying it." This is the analogy, I should point out, often being used by the proponents of these systems, making one question their facility with analogy, if nothing else.