58On the contrary, that concept requires the difference in treatment found to exist to be justified by the presence of precise and specific 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 difference in treatment in fact responds to a genuine need, is appropriate for achieving the objective pursued and is necessary for that purpose. Those circumstances may result, in particular, from the specific nature of the tasks for the performance of which such part-time contracts have been concluded and from the inherent characteristics of those tasks or, as the case may be, from the pursuit of a legitimate social policy objective of a Member State (see, to that effect, judgment of 1 March 2012, O’Brien, C‑393/10, EU:C:2012:110, paragraph 64 and the case-law cited, and order of 15 October 2019, AEAT (Calculation of the length of service of vertical-cyclical part-time workers), C‑439/18 and C‑472/18, EU:C:2019:858, paragraph 47).
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