 During the years that followed the definitions of the base units and particularly the "mise en pratique" to realize these definitions have been refined.The formal definition of International System of Units (SI) along with the associated resolutions passed by the CGPM and the CIPM are published by the BIPM on the Internet and in brochure form at regular intervals.The eighth edition of the brochure "Le Système International d'Unités – The International System of Units" was published in 2006.