THE GROUP WAS BORN IN INGÉROP 1992 from the merger of INTER ESAs and G, two technical engineering companies were complementary path: INTER G, created in 1945, specialising in power stations, hotels, Hospitals, and, from the 80s, aussi trams then, reacquired by GTM, in 1984, in order to icts economic development of turnkey activity, STPs, founded in 1962 by Francis Germain Within the GTM group to be icts for technical studies department structures and complex structures, and Which Grew into the wide fields of managing linear infrastructure projects, urban transportation networks, buildings and industrial facilities. Christian Delage, who, at the Beginning of the year 1988, succeeded to the presidency Francis Germain of STPs, was the architect of this merger. The newly combined company, constituted under the name INGÉROP, is multi-disciplinary and Strongly anchored in territorial terms