This article starts from one assumption: while attribution of the Administration to regulate administrative procedures is not under discussion, competency of parliament to make rules, in order to regulate the exercise of citizen's rights facing Administration, can not also be ignored. Then, an analysis of harmonization among competition principle with legality and efficiency principles, also importance of citizen participation in public decision-making and public hearings, is carried out. Main aspects of relationship between administrative procedure and effective judicial guardianship and some new functions of administrative procedure, as information and consensus, have been finally developed in this article.