Although the current interest in informal learning seems recent, performance improvement professionals have long had an interest in informal learning-the ways that people learn outside of formal structures. The earliest forms of learning for work were informal, including de facto and formal apprenticeship programs and the "school of…

Teacher evaluation has emerged as a major focus for reform at the highest levels of education policymaking, and for good reason. Most evaluations are based on scant evidence of actual effectiveness, produce inflated ratings, and provide teachers with little useful feedback. This paper offers policymakers and practitioners important "lessons…