For an efficient communication and that law can be better understood and actuated correctly, it is essential that law and every normative font have been well written. It’s necessary good rules, where can be possible to know the impact of law in citizens and enterprises. To write law, in effect, consists in 
beginning a process of legislative learning, where juridical communication can be clarify and can be specific in order to create shout-court circuits in a manner that instruments and objectives of the public action can be related in an rationale form and cultural accepted. The main instruments used by European governments to project norms of good quality are: the analysis of the impact regulation (AIR), consultation in the Air context, simplification, frequently supported by impact analysis, to access to the regulation and expost valuation of the regulators institutes and of the specific instruments. (VIR o AIR ex post). The attention to a better quality of legislation has assumed by time global dimensions: far away of been and affair of the internal regulation national systems, it has the motivation of specific initiatives of international organizations such as OCSE, FMI, WTO, inside of the political, institutional,
international and communitarian debate. In the European space, particularly, the first step of this critical rethinking process of communitarian law-making has been the ratification of Maastricht Treaty and, in particular, The Edinburgh
European Council of 1992. In 2002, after a process of experiences in matter of impact valuation, the UE has been initiated, inside of the action program of legislation’s improvement, a process of impact valuation to all main legislative initiatives’. The introduction of this procedure has signed, in the European space, an important cultural change in the Commission, been and integral part of the work and of the decisional process of this institution, capable to modify the way of elaborate politics, and, specially, to improve the communitarian law process.