Huh, what do you make of that? Hmmm.

…researchers said the study results showed that school systems, instead of focusing on whether and how teachers are certified before hiring, should worry more about getting rid of teachers who perform badly during probationary periods. Currently … large urban school systems like New York with dismal teacher retention rates tend to approve tenure for all teachers who decide to stay on, rarely giving out unsatisfactory ratings to teachers who perform badly.

Hmmm. Peter Gorman, you listening?