Judgment_paragraph 32 · La Cascina Soc. coop. arl and Zilch Srl v Ministero della Difesa and Others and Consorzio G. f. M. v Ministero della Difesa and La Cascina Soc. coop. arl (C-226/04, C-228/04)

32It should be stated, however, that the principles of transparency and equal treatment which govern all procedures for the award of public contracts, according to which the substantive and procedural conditions concerning participation in a contract must be clearly defined in advance, require that the period be determined with absolute certainty and made public in order that the persons concerned may know exactly the procedural requirements and be sure that the same requirements apply to all candidates. That period may be fixed by national legislation or the latter may confer that responsibility on the contracting authorities.