17 17.17. Staff of Auditor-General. PART 6 GENERAL 17.18. Procurement and other governmental contracts. 17.19. Management of statutory bodies. 17.20. Reserve Bank of Zimbabwe. CHAPTER 18 GENERAL AND SUPPLEMENTARY PROVISIONS PART 1 GENERAL PROVISIONS AS TO COMMISSIONS 18.1. Application of Part 1. 18.2. Commissions to be bodies corporate. 18.3. Membership of Commissions and conditions of service of members. 18.4. Functions and procedure of Commissions. 18.5. Funding of Commissions. 18.6. Commissions to report annually to Parliament. PART 2 GENERAL 18.7. Diligent performance of constitutional obligations. 18.8 Funding of constitutional bodies and other institutions. 18.9. Customary international law. 18.10. International conventions, treaties and agreements. 18.11. Amendment of Constitution. 18.12. Commencement of Constitution, transitional provisions and savings. PART 3 INTERPRETATION 18.13. Application of Part 3. 18.14. General principles of interpretation of the Constitution. 18.15. Definitions. 18.16. References to Chapters, sections, etc.