223In addition, it must be held that, having regard in particular to the specific nature of each review procedure, which makes comparisons extremely difficult, and also to the Commission’s discretion as to how it conducts investigations of such a technical and complex nature, the applicant has failed to establish that the differences in the manner in which the evaluation procedures subject to comparison took place were not objectively justified (see, to that effect, judgment of 19 January 2012, Xeda International and Pace International v Commission, T‑71/10, not published, EU:T:2012:18, paragraph 139 and the case-law cited).