Inspectors are to be sent into the Isle of Wight council amid concerns that they are failing to help their schools raise standards, Ofsted has announced.
The council will face a visit in a bid to find out why there are high numbers of under-performing schools in the area, the watchdog said.
It will be the first time Ofsted has examined how a local authority is helping schools improve.
Ofsted said the five-day visit will look at whether the council is offering enough support and challenge to their schools, and promoting high standards and fair access for all pupils.
Chief inspector Sir Michael Wilshaw said: "Inspectors will be going into Norfolk and the Isle of Wight because too many schools in these two areas are failing to provide a standard of education that children deserve."
"Ofsted's targeted inspection of schools in Norfolk earlier this year and recent school inspections in the Isle of Wight have raised serious concerns about the effectiveness of the local authorities' support and challenge.
In both cases, many school leaders have expressed the view that their local authority is not doing enough to challenge their institutions to improve."
More top news
Tuesday's weather for the west of the region
Tuesday's weather for the east of the region
Causes are thought to be climate change, fisheries, disease, and pollution.