An interview with David Berliner explores his claims that research on teacher effectiveness will only be applied practically when "connoisseurs of teaching" act as teacher coaches, helping teachers to analyze the effects of their behaviors, specify new behaviors, and assess the results. (PGD)

Extending the school day and year is not easy. The conventional calendar remains one of the most intractable features of the American educational system. Altering the traditional school schedule has significant ramifications for parents, students, teachers, and school administrators. This reform impacts student and family schedules, transportation…