Tuvalu is an independent constitutional monarchy. The head of state is the British monarch, whose representative on the islands is the governor-general, a Tuvaluan who has the power to convene and dissolve parliament (Sir Tomasi Puapua since June 1998). There is a unicameral legislature, the House of Assembly, with 15 members elected to four-year terms by universal adult suffrage. Seven islands elect two members each and one island elects one member. The cabinet is headed by the prime minister and has up to five ministers (all House members).