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"grey skies thinking"?

Posted by Pdianek on December 06, 2003

From the Independent: Eamonn O'Kane, general secretary of the National Association of Schoolmasters Union of Women Teachers, said it [*it* being the concept of schools in the future possessing just one teacher -- the head teacher, what in the US we call a "principal" -- and a plethora of classroom assistants] was "grey skies thinking" and the idea schools could get by with fewer teachers was "idiotic". Where did this phrase come from?