Electoral system family
Sierra Leone
Constitution
38. (1) Sierra Leone shall be divided into such constituencies for the purpose of electing the Members of Parliament referred to in paragraph (b) of subsection (1) of section 74 of this Constitution as the Electoral Commission, acting with the approval of Parliament signified by resolution of Parliament, may prescribe. (2) Every constituency established under this section shall return one Member of Parliament.
http://www.sierra-leone.org/Laws/constitution1991.pdf
Electoral Act 2002
43. Any general election of ordinary members of Parliament shall be by:
a. the one-member constituency system under subsection (2) of section 38 of the Constitution, if before the date of the election constituencies have been established in accordance with subsection (3) of section 38 of the Constitution;