Explanation:

The Act amended the Indian Councils Act 1861 and the Indian Councils Act 1892:
1. The members of the Legislative Councils, both in the centre and in the provinces, were to be of four categories: ex officio members (Governor General and the members of their Executive Councils), nominated official members (those nominated by the Governor General and were government officials), nominated non-official members (nominated by the Governor General but were not government officials) and elected members (elected by different categories of Indian people).
2. The maximum number of nominated and elected members of the Legislative Council at the Center was increased from 16 to 69, excluding ex officio members.
3. The maximum number of nominated and elected members of the provincial legislative councils, under a governor or lieutenant governor, was also increased. It was fixed as 50 in Bengal, Bombay, Madras, United Provinces, and Eastern Bengal and Assam, and 30 in Punjab, Burma, and any lieutenant-governor province created thereafter. Legislative councils were not created for provinces under a chief commissioner.
4. The right of separate electorate was given to the Muslims.
5. Official members were to form the majority but in provinces, nonofficial members would be in majority.