It was formed in 1973 and being used on as it is bases except a small number of minor amendments which were done over the years right from 1973. Law defines the role of Islam in the state, sharing of power between federal and provinces and talks about the roles of President and prime minister of Pakistan. Over the time law was modified which somehow been affecting mostly the powers of President, for example, the last related amendment grabs away the power of dissolving the national assembly from the president. This was done due to alleged misuse of this section by previous presidents of the country.
Recently, we have put an effort to the constitution available online and you can reach to it here: Constitution of Pakistan. We have the vision to make it more interactive so that you can easily reach to whatever you are searching for. You can give your feedback below in comments.
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