The main difference is that Pakistan is the only country with an urban framework, as well, in the region today; and Pakistan's system has common-representational framework between tiers (as Montreal and Birmingham also have in two-tier context—even though Birmingham is working on implementing a three-tier system); and, it has a bottom-up representational framework like the Canadian example. Pakistan had the only three-tier integrated bottom-up common-representational local government system, until it was adapted for another country in 2003. UK, the country which first introduced this methodology in the region, also has the urban examples of London and Birmingham (being implemented in the post-2001 era by building on steps first introduced in the 1980s); as does France (where largest cities and smaller units have created such frameworks either by devolution (Marseilles and Lyon, in addition to Paris) or by integration of neighbouring units (such as the Nantes region pursuant to the Marcellin Act of the 1970s); and Canada.