This book shows that standards can be used to achieve better solutions, from the technical or/and economical point(s) of view. Moreover, they are technical design documents bringing the consensual European state of the art and/or giving guidance in a particular subject or to support the fulfillment of European Union Law. Without intending to be strictly a document on legal matters, this report also makes reference to some European Directives and Regulations that follow the New Approach legislative principles. The Construction Products Regulation is also mentioned, although not being part of this group of legislative pieces.