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. Agreement was reached in principle that a federal system of government should be introduced, comprising the provinces of British India and those princely states that were willing to accede to it. However, division between Congress and Muslim representatives proved to be a major factor in preventing agreement on much of the important detail of how federation would work in practice.