Ofsted is required to inspect all maintained schools on a three year cycle. Within the cycle, the timing of inspections is determined by Ofsted. Decisions on scheduling take account of a range of factors which may include the stability of school leadership. If parents have concerns about the leadership and management of their child's school, they may complain to Ofsted, which has powers to investigate. Such an investigation could lead to a school being inspected. The Chief Inspector has powers to inspect a school at any time and the Secretary of State has powers to require Ofsted to inspect a school.