After 4 years working alone, Houdin was joined by a team of engineers from the French 3D software company Dassault Systèmes, who used the most modern computer-aided design technology available to further refine and test the hypothesis, making it (according to Houdin) the only one proven to be a viable technique. In 2006 Houdin announced it in a book: "Khufu: The Secrets Behind the Building of the Great Pyramid", and in 2008 he and Egyptologist Bob Brier wrote a second book: "The Secret of the Great Pyramid".