(1) A public entity may procure a consultancy service for the following work by selecting the quality method:
(a) A work of such nature that expected work from the consultant cannot be clearly ascertained like economic or sectoral study of the country, multi-sector feasibility study, design of a mechanism for managing and disposing hazardous wastes, design of urban master plan, financial sector reform and in respect of which the public entity expects a research proposal from the consultant,
(b) A work of a type that requires higher expertise and that causes serious and long-term impacts in the future, such as feasibility study or structural engineering design of large dams or major infrastructure building or policy studies of national importance, management study of large governmental bodies,
(c) A work of a type the service charge of which depends upon the quality of work or that may be performed substantially in different ways by each individual or organization and cost of the competitive proposal of which cannot be compared, such as management consultancy or sectoral and policy studies.
(2) Approval of the head of department shall be obtained to select the quality method pursuant to sub-rule (1).
(3) The least cost method may be selected for the work which has already been well practiced, is of regular nature and requires low cost, such as auditing, general engineering design and procurement agent.