Ecole: ESC TOULOUSE Niveau: BAC + 5 Since the implementation of the first computerized reservation systems (early 1960's), the tourism sector is one of the most extensive “user” of the information and communication technologies (ICT). The gathering, processing and communication of information is key to the sector. The wide range of possibilities of action and approach made available by the ICTs provoked a great change in the attitudes and behaviour of both consumers and producers. Sophisticated software applications are available, they are called: CRM (customer relationship management), SCM (supply chain management), ERP (enterprise resource planning), and KM (knowledge management). Nowadays, it is obvious that any advanced and experienced organization cannot survive, in our dynamic economy, without making a good use of these techniques. CRM seems to be the most important software application to be used in the tourism sector