The Sovereign is one of the three components of Parliament; the others are the Senate and the House of Representatives. The Governor-General is also responsible for summoning the House of Commons, though it remains the Monarch's prerogative to prorogue, and dissolve Parliament. The new parliamentary session is marked by the State Opening of Parliament, during which either the Sovereign or the Governor-General reads the Speech from the Throne in the Senate Chamber, outlining the Government's legislative agenda. Prorogation usually occurs about one year after a session begins, and formally concludes the session. Dissolution, the timing of which is affected by a variety of factors, ends a parliamentary term (which lasts a maximum of five years), and is followed by general elections for all seats in the House of Commons. The Monarch or the Governor-General may theoretically refuse a dissolution.