The factors that gave rise to the power of the Canadian Prime Minister are the very structure of the Canadian Westminster system and its effect on the legal powers of the Prime Minister, the conventions unwritten and the decline of the power of the Crown. Firstly, the Prime Minister's powers, by their very nature, are very broad in terms of what he can do as an executive branch. Secondly, the history and development of unwritten conventions have created a tradition in which very few sources of constraints can be imposed on the Prime Minister within the parliamentary system. Finally, with the decline of the Crown's powers, the existence of absolute control of power ceases. These structural and historical factors of Westminster-style Canadian government form the basis of a strong and domineering de facto head of state, the Prime Minister. The executive branch of the Westminster system gives any Prime Minister enormous power to run, manage and stop the government. In essence, there are no constraints on the Prime Minister from either the House or the Cabinet (Aucoin 113). In terms of directing the government, the Prime Minister also has the authority to create policies and bills without consulting any other government body, leading to rapid implementation of the same as long as the House agrees (Aucoin 111). Very few government systems would allow a single representative to direct policy at will, in fact, the Canadian Prime Minister scored higher than all other Westminster systems on the PM scale, which measures the degree of influence over decision-making and King's index, which measures the degree of influence on government (O'Malley 8). Furthermore, in terms of running the government, Aucoin also highlights that the Prime Minister has a broad spectrum of executive responsibilities? Westminster Legacies of Executive Power." Parliamentary Affairs 66.3 (2013): 579-96. Oxford Journals. Web. 13 March 2014. Lewis. "Elite Attitudes on the Centralization of Power in Canadian Political Executives: A Survey of Former Provincials and Federal Cabinet Ministers, 2000–2010." Canadian Journal of Political Science46.4 (2013): 799-819. Cambridge Journals Online. Web. 13 March 2014. Messamore, Barbara J. "'The Line over which He Must Not Pass ": Definition of the Office of the Governor General, 1878." Canadian Historical Review 86.3 (2005): 453-84. Print.O'Malley, Eoin. “The Power of Prime Ministers: Results of an Expert Survey.” International Political Science Review 28.1 (2007): 7-27. SAGE Journals. Web. March 13, 2014. Svoie, Donald J. "Power at the Pinnacle: Canadian Politics 5th Edition (2004): 145-61 Web. 2014.