Not only did U.S. educators play a leading role in designing and carrying out the study, but the results, which showed U.S. high school students lagging behind those in other industrial countries, attracted widespread attention in the news media and in educational circles.

UNESCO: II Part Analytic Section

Despite decades of research on students and teachers, the concept is still highly controversial within educational circles, and it's almost completely unproven in workplace settings.

FORBES: I Feel Your Pain