Recital 37

(37)With a view to an appropriate integration of environmental, social and labour requirements into public procurement procedures it is of particular importance that Member States and contracting authorities take relevant measures to ensure compliance with obligations in the fields of environmental, social and labour law that apply at the place where the works are executed or the services provided and result from laws, regulations, decrees and decisions, at both national and Union level, as well as from collective agreements, provided that such rules, and their application, comply with Union law. Equally, obligations stemming from international agreements ratified by all Member States and listed in Annex X should apply during contract performance. However, this should in no way prevent the application of terms and conditions of employment which are more favourable to workers. The relevant measures should be applied in conformity with the basic principles of Union law, in particular with a view to ensuring equal treatment. Such relevant measures should be applied in accordance with Directive 96/71/EC of the European Parliament and of the Council ¹¹ and in a way that ensures equal treatment and does not discriminate directly or indirectly against economic operators and workers from other Member States.