In my book, The Collapse of Parenting, I share data from many sources — including the National Institutes of Health, international databases such as the PISA program,
scholarly papers by researchers such as Professor Jean Twenge, and many other sources —
showing that American kids are indeed more likely to be obese, less likely to be physically fit, more likely to be anxious and depressed, compared with American kids 30 years ago — and in the case of academic
achievement, doing much less well compared with kids in other countries, again a big change compared with American kids 30 years ago.
He provides evidence from several decades of
scholarly research on teacher effectiveness to
show that teachers do make a difference in student
achievement as measured by large - scale standardized
achievement tests.