The authors report on three experiments designed to (a) test under increasingly more favorable conditions whether judges can correctly rate teachers of known ability to raise student achievement, (b) inquire about what criteria judges use when making their evaluations, and (c) determine which criteria are most predictive of a teacher's…

Knowledge of the equal sign as an indicator of mathematical equality is foundational to children's mathematical development and serves as a key link between arithmetic and algebra. The current findings reaffirmed a past finding that diverse items can be integrated onto a single scale, revealed the wide variability in children's knowledge of the…