English cities vote on elected mayors for councils
17 April 2012 Last updated at 11:29 BST
Powers for new directly-elected mayors are not clear enough and should be extended beyond city boundaries, a study has found.
The Warwick Commission Report comes weeks before people in 10 English cities vote on whether to switch from a council leader and cabinet system to a directly-elected mayor running their councils.
Susana Mendonca reports from the West Midlands and spoke to Birmingham Chamber of Commerce chief executive Jerry Blackett, Warwick Commission Research Director Prof Keith Grint and Centro chief executive Geoff Inskip.