The tourist guide is a storyteller. In a given geographical area, he knows how to make the stones of churches, monuments and streets speak to reveal their secrets in several languages. Thanks to him, customers discover a city, a district, a museum, with precision. The tourist guide also fulfills supervision missions. For his group, he supervises precise and timed circuits. Visiting time, choice of places to stop and eat, he designs coherent routes both spatially and thematically. His field missions are coupled with significant research work, especially for the guide-writers who imagine new products to offer to agencies.