144 (a) the qualifications of those persons; (b) the conditions of service, conduct and discipline of those persons; (c) the independence, impartiality and integrity of those persons; and (d) the organisation, efficiency and well-being of the Auditor-General’s office. PART 6 GENERAL 17.18 Procurement and other governmental contracts (1) An Act of Parliament must prescribe procedures for the procurement of goods and services by the State and by all institutions and agencies of government at every level, so that procurement is effected in a manner that is transparent, fair, honest, cost-effective and competitive. (2) An Act of Parliament must provide for the negotiation and performance of the following State contracts— (a) joint-venture contracts; (b) contracts for the construction and operation of infrastructure and facilities; and (c) concessions of mineral and other rights; to ensure transparency, honesty, cost-effectiveness and competitiveness. 17.19 Management of statutory bodies An Act of Parliament must provide for the competent and effective operation of statutory bodies and, in particular, must ensure that their chief executive officers serve for limited periods whose renewal is dependent on the efficient performance of their duties. 17.20 Reserve Bank of Zimbabwe (1) There is a central bank, to be known as the Reserve Bank of Zimbabwe, whose objects are— (a) to regulate the monetary system; (b) to protect the currency of Zimbabwe in the interest of balanced and sustainable economic growth; and (c) to formulate and implement monetary policy. (2) An Act of Parliament may provide for the structure and organisation of the Reserve Bank of Zimbabwe and confer or impose additional functions on it.