As early as 1917, Britain had toyed with the idea of giving India a measure of self-government: “the gradual development of self-governing institutions with a view to the progressive realisation of responsible government in India as an integral part of the British Empire”.
In 1919, the Government of India Act was introduced.
This introduced a national parliament with two houses for India.
About 5 million of the wealthiest Indians were given the right to vote (a very small percentage of the total population)
Within the provincial governments, ministers of education, health and public works could now be Indian nationals
A commission would be held in 1929, to see if India was ready for more concessions/reforms.
However, the British controlled all central government and within the provincial governments, the British kept control of the key posts of tax and law and order.