In order to be able to carry out a proper comparison of financing offers, the Contracting Authority should set out in the tender documents clear minimum requirements and evaluation criteria to facilitate a correct comparison of (uncommitted) bond financed bids as against committed bank or corporate financed bids. The same complexity occurs when bidders are allowed to submit offers with mixed financing. The Contracting Authority may also wish to include requirements relating to rating (both the level and the identity of the agency or agencies providing the rating).In addition to assessing price (which may be difficult without a firm pricing commitment), it is key to assess the risk and robustness of the pricing methodology used by bidders for any proposed bond solution (detailing the various pricing components). The pricing methodology should refer, to the extent possible, to market prices for similar bond issues or baskets of bond issues or, where such comparators are not available, sovereign issuances or issuances by government agencies or parastatal organisations could potentially be used as reference points. When seeking final offers, the Contracting Authority may consider providing indicative bond pricing data or benchmark yield curves on which bidders can base their offers. Bidders would use such pricing in their financial models to derive the price of their offer. Such pricing data should break down information according to different rating outcomes and other key features of the financing. The Contracting Authority could consider setting a pricing range within which the PPP remains affordable and the bonds would be issued and reserving the right not to close the transaction if pricing falls outside this range.