More than a decade ago, the Trends in International Mathematics and Science Studies observed that teachers in the United States focused more on "high-interest activities" (games, dramatic presentations, humor, and so on) than on the development of challenging concepts. Since then, the authors have worked with many teaching teams to shift…

The Australian Council for Educational Research (ACER) is one of the world's leading educational research centres. Since it was established in 1930, ACER has built a strong reputation as a provider of reliable support and expertise to education policymakers and professional practitioners. Each year, ACER is involved in a large number of research…