quiet-the-power-of-introverts-in-a-world-that-cant-stop-talking-susan-cain

19. According to a 2002 nationwide survey:
Christopher Barnes, “What Do Teachers
Teach? A Survey of America’s Fourth and
Eighth Grade Teachers,” conducted by the
Center for Survey Research and Analysis,
University of Connecticut, Civic Report no.
28, September 2002. See also Robert E.
Slavin, “Research on Cooperative Learning
and Achievement: What We Know, What
We Need to Know,” Contemporary Educational
Psychology 21, no. 1 (1996): 43–69
(citing 1993 national survey findings that
79 percent of elementary school teachers
and 62 percent of middle school teachers
made sustained use of cooperative learning).
Note that in “real life,” many teachers
are simply throwing students into groups
but not using “cooperative learning” per se,
which involves a highly specific set of procedures,
according to an e-mail sent to the
author by Roger Johnson of the
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