Traditional teacher evaluations -- full-lesson observations, write-ups, and debriefs -- are time-consuming and largely ineffective. As a principal, Kim Marshall found that mini-observations -- short, frequent, unannounced classroom visits, each followed by a face-to-face coaching conversation and brief narrative summary -- actually improved…

The field of mathematics education has engaged in perennial debate about whether transmission-oriented or constructivist approaches to teaching will best help students learn. Yet, both fluency, learned through step-by-step procedural instruction, and the mathematical flexibility that comes from constructivist methods play an important role in…