Ofsted has a new, hard-line chief inspector and a new, tougher inspection regime - and in the past few months that has led to a spike in the number of schools deemed inadequate.
Predictably, there has been a corresponding wave of anger in schools - with a growing number taking to the courts to challenge the inspectors' views?
So are the inspectors really up to the job? And who inspects the inspectors?
Fran Abrams investigates.
Producer: Rob Cave.