Ofsted carries out regular inspections of each school in England, resulting in a published evaluation of the effectiveness of the school. An adverse report may include a recommendation for further intervention in the running of the school.
Before 2005, each school was inspected for a week every six years, with two months' notice to prepare for an inspection. This regime was criticised by teachers and school heads as greatly disruptive of the operation of the school, and by others as enabling schools to present an unrealistic picture of themselves that did not truly reflect the quality of teaching and learning in the school.
After an inspection of a school, Ofsted published a report on the school on its website. In addition to written comments on a number of areas, schools were assessed on each area and overall on a 4-point scale: 1 (Outstanding), 2 (Good), 3 (Satisfactory) and 4 (Inadequate). Schools rated Outstanding or Good might not be inspected again for five years, while schools judged less favourably were inspected more frequently, and might receive little or no notice of inspection visits.
Figures published in March 2010 showed that revised inspection criteria, which were introduced in September 2009, resulted in a reduction from 19% to 9% in the number of schools judged to be Outstanding, and an increase from 4% to 10% in the number of schools judged to be Inadequate.
A framework for section 5 inspections of academies and maintained schools was introduced from January 2012, and replaced with another new framework in September 2012. Public consultation was undertaken,