VTOS is structured in units of competence using a modular format so that it is flexible and easily adapted for different jobs, personnel and qualifications. It is suitable for use in small to medium enterprises, large hotels, tour operator and travel companies, as well as for use in colleges and educational institutions. It can be used as the basis for curriculum in colleges. The Vietnam tourism occupational standards (VTOS) for Travel and tour operations covers jobs at five levels from trainee reservations clerk (Level 1) to assistant reservations manager (Level 3) up to branch manager (Level 5).