of all Indian federations consisting of provinces and princely states as units. the act divided the powers between centre and units in terms of three lists-Federal list, the Provincial list and the concurrent list. Background Indians had increasingly been demanding a greater role in the government of their country since the late 19th century. The Indian contribution to the British war effort during the First World War meant that even the more conservative elements in the British political establishment felt the necessity of constitutional change, resulting in the Government of India Act 1919. That Act introduced a novel system of government known as provincial "diarchy", i.e., certain areas of government (such as education) were placed in the hands of ministers responsible to the provincial legislature, while others (such as public order and finance) were retained in the hands of officials responsible to the British-appointed provincial Governor. While the Act was a reflection of the demand for a greater role in government by Indians, it was also very much a reflection of British fears about what that role might mean in practice for India (and of course for British interests there). The experiment with dyarchy proved unsatisfactory. A particular frustration for Indian politicians was that even for those areas over which they had gained nominal control, the "purse strings" were still in the hands of British officialdom. The intention had been that a review of India's constitutional arrangements would be held ten years on from the 1919 Act. In the event, the review was conducted ahead of time by the Simon Commission, whose report proposed the scrapping of diarchy, and the introduction of a much larger degree of responsible government in the provinces. This proposal was controversial in Britain, demonstrating the rapidly widening gulf between British and Indian opinions as to the desirability, extent, and speed of progress towards, the promised system of self-government contained in the 1919 Act's preamble. Although the Simon Commission had taken evidence in India, it had met with opposition there, and its conclusions weren't accepted by Congress (the largest political party). In an attempt to involve Indians more fully in working out a new constitutional framework, a series of Round Table Conferences were then held in the early 1930s, attended at times by representatives from India's main political parties, as well as from the princely states. The agreement was reached in principle that a federal system