36In that regard, it must be borne in mind, first, that the principle of equal treatment requires tenderers to be afforded equality of opportunity when formulating their tenders, which therefore implies that the tenders of all tenderers must be subject to the same conditions. Second, the obligation of transparency, which is its corollary, is intended to preclude any risk of favouritism or arbitrariness on the part of the contracting authority. That obligation implies that all the conditions and detailed rules of the award procedure must be drawn up in a clear, precise and unequivocal manner in the contract notice or specifications so that, first, all reasonably informed tenderers exercising ordinary care can understand their exact significance and interpret them in the same way and, second, the contracting authority is able to ascertain whether the tenders submitted satisfy the criteria applying to the contract in question (see, to that effect, judgment of 6 November 2014 in Cartiera dell’Adda, C‑42/13, EU:C:2014:2345, paragraph 44 and the case-law cited).
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