These Changes Helped (1950)
"What changes in your school within the last three years have been most helpful to you for doing a better job of teaching?"
In April 1950, Educational Leadership published "These Changes Helped," which discussed the result of asking 850 teachers in six school systems this question. The big shocker (or not, depending on your point of view): A full 44 percent could not name a single change that had been helpful.
Read the article: These Changes Helped (PDF)
Tellingly, these nonresponses were mostly clustered together in certain schools; other schools had 100 percent response rates, the teachers eager to relate useful changes. Most commonly cited among those changes were new