Contractors or manufacturers, small and large, should be allowed to bid for individual contracts or for a group of similar contracts at their option, and all bids and combinations of bids should be opened and evaluated simultaneously so as to determine the bid or combination of bids offering the most advantageous solution for the recipient (see Para. 3.8 for the bid evaluation procedures). In certain cases, e.g. where special or closely integrated manufacturing are involved, the OPEC Fund may accept a turnkey contract under which the eng ineering, all the equipment, and the construction of a complete plant are provided through a single contract, or a single responsibility contract under which all the goods and works except the engineering are provided through a single contract. Detailed engineering of the works or goods to be provided, including the preparation of technical specifications and other bidding documents, should precede the invitation to bid for the contract. However, in the case of turnkey con tracts or contracts for large complex projects, it may be undesirable to prepare technical specifications in advance. In such a case, it will be necessary to use a two- step procedure inviting unpriced technical bids subject to technical clarifications and adjustments, followed by the submission of priced proposals. 1.3 Notification and advertising The potential bidders should be notified in a timely manner (see also Para. 3.1) of the opportunity to bid. For contracts subject to international competitive bidding, this is done by transmitting copies of the invitation to bid, or the advertisement of the invitation, to local representatives of countries that are potential suppliers of the goods or services required and, where specifically requested, to the OPEC Fund also. The notification should be made at the same time as the advertisement of the invitation to bid. Invitations to bid should also be advertised in at least one newspaper of general circulation in the country where the project is to be carried out. For large, specialized, or important contracts, the OPEC Fund will, in addition, require that invitations to bid be advertised in the “UN Development Forum” or such other well-known technical magazines, newspapers, and trade publications of wide international circulation in sufficient time before bids are to be opened to enable prospective bidders to request bidding documents and prepare bids. If the preparation and issue of bidding documents for a project is likely to extend over a period of years, a brief description of the works to be undertaken and the types of goods and services required should be advertised and notified to the potential bidders, as described above, at least 60 days before the first normal invitations to bid are issued, with a request that those who wish to be included in a mailing list and to receive invitations to bid should express their interest by inform ing the recipient. The recipient should invite bids from all suitably qualified parties expressing such interest.
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