As teacher resignation letters increasingly go public – and viral – new research indicates teachers are not leaving solely due to low pay and retirement, but also because of what they see as a broken education system.

In a trio of studies, Michigan State University education expert Alyssa Hadley Dunn and colleagues examined the relatively new phenomenon of teachers posting their resignation letters online. Their findings, which come as many teachers are signing next year’s contracts, suggest educators at all grade and experience levels are frustrated and disheartened by a nationwide focus on standardized tests, scripted curriculum and punitive teacher-evaluation systems.

Read more at Michigan State University