European directives create european acquis of public procurement, the purpose being promoting and implementing legislative changes at national level. The provisions of directives must control procedures of public procurements, so that they become more simple to offer better results in the outcome of the process, to ensure the highest quality and effective price-quality ratio, to facilitate access of participants in tenders. Thus it is necessary to explore practical ways in which the common market, regulated at the legislative level, can be turned everyday into a practical reality in which the implicated people can access in real time to all offers, published by public entities, in a standardized and understandable way.