General 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, as per the Constitution. However, Parliament can also be 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.