A Commentary on self-contained classrooms in the Jan. 25, 2012, issue of Education Week confused the meaning of a sentence in the piece. It should have read: “The cause is simple: the 19th-century ‘egg crate’ school and its key design feature, a self-contained, four-walled classroom with a fully qualified teacher for every 25 or so students (well, maybe 30 or 35, or even more in hard times).”
A version of this article appeared in the February 01, 2012 edition of Education Week as Correction
