In April 2008, CIGRE (International Council on Large Electric Systems) formed a new Working Group C4.407, named "Lightning Parameters for Engineering Applications". <...> C.A. Nucci (then Convener of the CIGRE Study Committee C4) and Prof. <...> M. Ishii (Convener of the Advisory Group C4.4). <...> The WG C4.407 was composed of 21 members from North and South America, Europe, and Asia. <...> It was tasked to prepare a CIGRE Reference Document (Technical Brochure) on lightning parameters needed for engineering applications. <...> CIGRE WG C4.407 has completed its work on the Technical Brochure in May 2013! <...>