The head of the Canadian government is the leader of the political party with the most seats in the House of Commons. As Prime Minister one has the right to the title of Right Honourable. A Prime Minister's elected term is for a maximum of 5 years, however an election can be called at any time. By custom, elections are called 3.5 to 4 years after the previous election, when a majority government is in power. If a minority government is in power, a vote of non-confidence in the House of Commons may lead to a quick election (9 months in the case of the most recent Canadian minority government, the Clark government of 1979-1980).
The Prime Ministers of Canada
To give credit where credit is due, I'm getting information for the stub entries from http://cnet.unb.ca/achn/pme/index.html . After an article has been fleshed out, the data contained in them has been collected from a large pool of sources (some of which correct data found in at the University of New Brunswick website, even). I just thought it would be appropiate to indicate the source for the stub articles. --Colin dellow