Education is seen as a resource at a global level but is currently considered to be in crisis in many parts of the world. This constitutes a significant drawback in terms of humanity's prosperity and well-being since education is the key not only to an educated workforce but also to humane, collaborative, and caring societies. Even within this dim…

Randomized experiments are often considered the strongest designs to study the impact of educational interventions. Perhaps the most prevalent class of designs used in large scale education experiments is the cluster randomized design in which entire schools are assigned to treatments. In cluster randomized trials (CRTs) that assign schools to…

This article recounts the battle in the "math wars" that took place in Massachusetts, United States in 1999-2000 over the scope, content and teaching of the state's K-12 mathematics curriculum. Harsh controversies arose between the partisans of a "reform-math" movement stressing an undefined "conceptual understanding"…