National governmental and political structure
Pakistan has a bicameral system of government, with a President as head of state and a Prime Minister elected by a 340 member National Assembly. Elections are to be held every five years according to the Constitution of Pakistan, with every Pakistani over the age of 18 entitled to elect representatives from each constituency. Concurrently, elections are also held to elect members of the four Provincial Assemblies for each province. A higher chamber, the Senate, is then elected on the basis of representation from each Provincial Assembly. The electoral college of the National and Provincial Assemblies together elects the President of Pakistan, who used to have extensive powers due to amendments in the 1973 Constitution of Pakistan, but these have once again been reduced to primarily ceremonial duties. Local government plays no role in the elections of either the Senate, the President or in the political and electoral structure of Pakistan.
Pakistan's political and electoral system is loosely based on the principles from the Westminster model, which is prevalent in most countries that have been colonies of the United Kingdom of Great Britain. In Pakistan a thriving multi party system exists both at the national and provincial levels. Hundreds of parties exist in the political arena, with often scores of candidates contesting one assembly seat. However, since the return of democracy in 1988, only two parties have formed four national level governments, both twice each. They have also had recourse to form coalitions with other smaller parties to form a majority. At the provincial level, along with the two main national parties, a large number of smaller province-level parties have also shared power in each of the four provinces. Although party politics dominates heavily, independent persons as well as members of government at the provincial level have been part of the assemblies too.
Evolution of Local Government, its Legal and Political Background
Local governments have existed in the Indian subcontinent for many centuries, with the first municipal corporation set-up in Madras in 1688 by the East India Company. In 1842, the Conservancy Act which lead to the formation of sanitary committees for garbage disposal became the first formal measure of municipal organization which applied to the Bengal Presidency. In Karachi, the Board of Conservancy was established in 1846, while in Lahore and Rawalpindi, the Municipal Act was passed in 1867. Subsequent important events were Lord Ripon's Resolution on local self-government in 1882, which allowed for the provision of some elected members in municipal committees and proposed the establishment of rural local governments. The 1907 Decentralization Commission recommended the appointment of non-official Chairmen of municipal committees, a recommendation which was endorsed and extended further by the 1925 Simon Commission set up to assess the performance of local self-government. The 1935 Government of India Act allowed provincial autonomy and permitted provinces to frame legislation on local government systems.

__________________
Thanks to Allah almighty who Mould me Human