The course in business or within an institution is intended to complement the academic training of students by offering them the opportunity: to gain experience (limited) in a trade of the economy, to apply their knowledge in economics to solve an economic problem concrete, pursuing a critical and analytical. The course is organized during the 1st semester of 2nd year of the Master 120 to specialization. Its duration is minimum 3 months. The student, in consultation with the supervisor of the host, will define a draft stage, clarifying the tasks and missions that the student will complete during the probationary period. At the end of the second week of internship, the student must formulate a question of an economic nature which he should respond in detail in his report.