Judgment_paragraph 27 · Federación de Servicios Privados del sindicato Comisiones obreras (CC.OO.) v Tyco Integrated Security SL and Tyco Integrated Fire & Security Corporation Servicios SA (C-266/14)

27In that regard, the Court has held that the concepts of ‘working time’ and ‘rest period’ within the meaning of Directive 2003/88 constitute concepts of EU law which must be defined in accordance with objective characteristics, by reference to the scheme and purpose of that directive, which is intended to improve workers’ living and working conditions. Only such an autonomous interpretation is capable of securing full effectiveness for that directive and uniform application of those concepts in all the Member States (see judgment in Dellas and Others, C‑14/04, EU:C:2005:728, paragraphs 44 and 45, and orders in Vorel, C‑437/05, EU:C:2007:23, paragraph 26, and Grigore, C‑258/10, EU:C:2011:122, paragraph 44).