What Is a "Professional Learning Community"?

The idea of improving schools by developing professional learning communities is currently in vogue. People use this term to describe every imaginable combination of individuals with an interest in education—a grade-level teaching team, a school committee, a high school department, an entire school district, a state department of education, a national professional organization, and so on. In fact, the term has been used so ubiquitously that it is in danger of losing all meaning.