Pusuc PROCUREMENT AND DisPOSAL OF Pusuc AssETs Cap.22:23 (b) (c) (d) (e) (f) (g) (h) (i) (j) No.S/2017 where, for technical or artistic reasons, or for reasons connected with protection of exclusive rights, the contract can be performed only by a particular supplier and no reasonable alternative or substitute exists; or where, for reasons of extreme urgency not attributable to and unforeseen by the procuring entity, the procurement requirement cannot be obtained in time by means of competitive bidding procedures; or for additional supplies of goods or services by a supplier, where a change of supplier would cause problems of inter-changeability or incompatibility with existing equipment or discontinuity of services, which would cause significant inconvenience or substantial duplication of costs to the procuring entity; or where a procuring entity procures a prototype or a first product or service from a research institute which is then developed at its request for a particular procurement contract for research, experiment, study or original development; or where additional services which were not included in an initial procurement contract but which were within the objectives of the original bidding documents have, through unforeseen circumstances, become necessary to complete the services described in those documents: Provided that the total value of contracts awarded for the additional services shall not exceed fifty per centum of the amount of the original contract; or for new services that repeat similar services provided under a procurement contract awarded following the competitive bidding method of procurement, where the procuring entity indicated in the original procurement notice that a direct procurement method might be used in awarding contracts for such new services; or for acquisitions made under exceptionally advantageous conditions from unusual disposals such as legal forfeitures, liquidation, insolvency, judicial sale in execution or other forced sale or disposal; or for the procurement of immovable property; or for the procurement of spare parts of a proprietary nature. (2) Direct procurement shall be conducted in accordance with such procedures as may be prescribed. 34 Request for quotations method ( 1) The request for quotations method of procurement entails a process in which the procuring entity solicits at least three competitive quotations for its procurement requirement from reputable suppliers, and the procurement requirement is below the prescribed threshold. (2) The request for quotations method of procurement shall be effected in accordance with such procedures as may be prescribed. PART VII PROCEDURES FOR CoMPETITIVE AND RESTRIC1ED BIDDING 35 Application of Part VII This Part shall apply to procurement by the competitive and restricted bidding methods. 36 Form of communication AU communications between bidders and the procuring entity shall be in writing, and a procuring entity shall not entertain or respond to a communication from a bidder that is not in writing: 63