The Government of India Act, 1935 derived material from four key sources viz. Report of the Simon Commission, discussions at the Third Round Table Conference, the White Paper of 1933 and the reports of the Joint select committees. This act ended the system of dyarchy introduced by the Government of India Act 1919, and provided for establishment of a Federation of India to be made up of provinces of British India and some or all of the Princely states. However, the federation never came into being as the required number of princely states did not join it.