40According to the settled case-law of the Court, the concept of ‘objective grounds’ requires the observed unequal treatment to be justified by the existence of precise and concrete factors, characterising the employment condition to which it relates, in the specific context in which it occurs and on the basis of objective and transparent criteria in order to ensure that that unequal treatment in fact responds to a genuine need, is appropriate for achieving the objective pursued and is necessary for that purpose. Those factors may result in particular from the specific nature of the tasks for the performance of which fixed-term contracts have been concluded and from the inherent characteristics of those tasks or, as the case may be, from pursuit of a legitimate social-policy objective of a Member State (see, inter alia, judgments of 13 September 2007, Del Cerro Alonso, C‑307/05, EU:C:2007:509, paragraph 53; of 22 December 2010, Gavieiro Gavieiro and Iglesias Torres, C‑444/09 and C‑456/09, EU:C:2010:819, paragraph 55; and of 5 June 2018, Grupo Norte Facility, C‑574/16, EU:C:2018:390, paragraph 54).
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