“ The criteria referred to in the second paragraph of Article 3b of the Treaty shall relate to areas for which the Community does not have exclusive competence. The principle of subsidiarity provides a guide as to how those powers are to be exercised at the Community level. Subsidiarity is a dynamic concept and should be applied in the light of the objectives set out in the Treaty. It allows Community action within the limits of its powers to be expanded where circumstances so require, and conversely, to be restricted or discontinued where it is no longer justified. ”

“ For any proposed Community legislation, the reasons on which it is based shall be stated with a view to justifying its compliance with the principles of subsidiarity and proportionality; the reasons for concluding that a Community objective can be better achieved by the Community must be substantiated by qualitative or, wherever possible, quantitative indicators. ”

“ Regarding the nature and the extent of Community action, Community measures should leave as much scope for national decision as possible, consistent with securing the aim of the measure and observing the requirements of the Treaty. While respecting Community law, care should be taken to respect well established national arrangements and the organisation and working of Member States' legal systems. Where appropriate and subject to the need for proper enforcement, Community measures should provide Member States with alternative ways to achieve the objectives of the measures. ”