The 20th Century School has as its educational center the autonomous teacher who exists in an egalitarian culture and is rarely, often never, effectively evaluated for impact on student performance, enthusiasm, and satisfaction. At all levels of the school, teachers are organized into silos of teaching (by grade or by content area) with little effective time within the silo to truly collaborate and professionally assess and grow, and equally little effective time to communicate outside the silo in any meaningful way. Teachers spend most of their time teaching on their own and preparing on their own to teach. Administrative meeting time, regularly scheduled, is universally disliked as irrelevant even though led by School Heads who themselves largely come from the teaching ranks.