Parliamentary elections in Singapore must be held within three months after five years have elapsed from the date of the first sitting of a particular Parliament of Singapore. However, in most cases Parliament is dissolved and a general election called at the behest of the Prime Minister before the five-year period elapses. The number of constituencies or electoral divisions is not permanently fixed by law, but is declared by the Prime Minister prior to each general election pursuant to the Parliamentary Elections Act (Cap. 218, 2011 Rev. Ed.), which governs the conduct of elections to Parliament, taking into account recommendations of the Electoral Boundaries Review Committee. For the 2015 general election, there were 89 seats in Parliament organised into 13 Single Member Constituencies (