The leader of Rochdale Council, Colin Lambert, said he expected the widened review into abuse allegations at the town's Knowl View School will be completed by the end of July.
Led by Neil Garnham QC, the major inquiry will look at claims of historical sex abuse linked to late Liberal Democrat MP Sir Cyril Smith, at premises owned, managed or operated by the council from 1961 to 1995.
Mr Garnham will be tasked with identifying whether there was a pattern to such abuse, whether it was tolerated, facilitated or promoted by the council or its officers and staff, and whether there was a council culture that "inhibited the proper investigation, exposure and prevention of such abuse".
More top news
The CIA has been criticised for 'live-tweeting' the killing of Osama bin Laden to mark the fifth anniversary of his death.
Argos has issued an urgent recall of certain car seats and warned parents to stop using them "immediately" over safety fears.
Two bodies found in the Himalayas have been identified as Alex Lowe and David Bridges - 16 years after they went missing.