The Constituent Assembly of India was set up as a result of negotiations between the Indian leaders and members of the British Cabinet Mission. The constituent assembly was elected indirectly by the members of the Provincial legislative assembly. The Congress secured an overwhelming majority in the general seats while the Muslim League managed to sweep almost all the seats reserved for Muslims. The Congress had a majority of 69%. There were also members from smaller parties like the Scheduled Caste Federation, the Communist Party of India and the Unionist Party.
The final Constituent Assembly had two hundred and seven representatives, including fifteen women. Only 28 members of the Muslim League finally joined the Indian Assembly. Later, 93 members were nominated from the princely states. The Congress thus secured a majority of 82%.
Dr. Sachchidananda Sinha was the first president(temporary Chairman of the Assembly )of the Constituent Assembly when it met on December 9,1946. Dr. Rajendra Prasad then became the President of the Constituent Assembly, and would later became the first President of India. The Vice President of the Constituent Assembly was Professor Harendra Coomar Mookerjee, former Vice-Chancellor of Calcutta University and a prominent Christian from Bengal who also served as the Chairman of the Minorities Committee of the Constituent Assembly. He was appointed Governor of West Bengal after India became a republic.
The Assembly approved the Constitution on January 26, 1949, making it official. On January 26, 1950, the Constitution took effect — a day now commemorated as Republic Day nationwide.
At this point, the Constituent Assembly became the Provisional Parliament of India, until the first elections under the new Constitution took place in 1952.