(2) An election to fill a casual vacancy in the membership of the Senate or the National Assembly must be held not later than four months after the vacancy occurred. 146 Qualifications of voters in parliamentary elections The qualifications for registration as a voter and for voting at Presidential and Parliamentary elections are set out in the Third Schedule. 147 Electoral Law Subject to Part I of Chapter XIII, an Act of Parliament must provide for– (a) the registration of voters; (b) the election of President, Senators, Members of the National Assembly and members of the governing bodies of Local Authorities including elections for the purpose of filling casual vacancies in Parliament and the governing bodies of Local Authorities; (c) the conduct of referendums. PART IX DELIMITATION OF CONSTITUENCIES 148 Fixing of boundaries of National Assembly constituencies and frequency of revision (1) Zimbabwe is, for the purpose of election of Members of the National Assembly, divided into two hundred and ten National Assembly constituencies. (2) It is the function of the Zimbabwe Electoral Commission to determine the limits of the National Assembly constituencies into which it is to be divided. (3) Once the Zimbabwe Electoral Commission has fixed the boundaries of National Assembly constituencies, the Commission must review them at intervals of at least five years. 149 Factors to be considered in delimiting constituencies (1) Subject to subsections (2) and (3), the boundaries of the National Assembly constituencies shall be such that at the time of delimitation the number of voters registered in each National Assembly constituency is as nearly as may be equal to the number of voters registered in each of the other National Assembly constituencies. (2) In dividing Zimbabwe into National Assembly constituencies, the Zimbabwe Electoral Commission shall, in respect of any area, give due consideration to– (a) its physical features; (b) the means of communication within the area; (c) the geographical distribution of registered voters; (d) any community of interest as between registered voters; and (e) in the case of any delimitation after the first delimitation consequent upon an alteration in the number of National Assembly constituencies, existing electoral boundaries; and whenever it appears necessary to do so in order to give effect to the provisions of this subsection, the Commission may depart from the requirements of subsection (1), but in no case to any greater extent than twenty per centum more or less than the average number of registered voters in National Assembly constituencies. - 60 -