Constitution of Kenya, 2010 55 parties. (5) The Commission shall exercise its powers and perform its functions in accordance with this Constitution and national legislation. Delimitation of electoral units. 89. (1) There shall be two hundred and ninety constituencies for the purposes of the election of the members of the National Assembly provided for in Article 97 (1) (a). (2) The Independent Electoral and Boundaries Commission shall review the names and boundaries of constituencies at intervals of not less than eight years, and not more than twelve years, but any review shall be completed at least twelve months before a general election of members of Parliament. (3) The Commission shall review the number, names and boundaries of wards periodically. (4) If a general election is to be held within twelve months after the completion of a review by the Commission, the new boundaries shall not take effect for purposes of that election. (5) The boundaries of each constituency shall be such that the number of inhabitants in the constituency is, as nearly as possible, equal to the population quota, but the number of inhabitants of a constituency may be greater or lesser than the population quota in the manner specified in clause (6) to take account of— (a) geographical features and urban centres; (b) community of interest, historical, economic and cultural ties; and (c) means of communication. (6) The number of inhabitants of a constituency or ward may be greater or lesser than the population quota by a margin of not more than— (a) forty per cent for cities and sparsely populated areas; and (b) thirty per cent for the other areas. (7) In reviewing Commission shall constituency and (a) consult all interested parties; and ward boundaries the