When one of the rights in question is exceptionally complex and particularly expensive to implement, states party must take steps to achieve the objectives of the Charter within a reasonable time, with measurable progress and making maximum use of available resources.
Centre européen des droits des Roms (CEDR) c. Bulgarie, réclamation n° 31/2005, décision sur le bienfondé du 18 octobre 2006, § 35.