Austrian law divides employees into two categories: white-collar workers and manual workers. Since there is no legal definition of the concept of a manual worker as distinct from that of a white-collar worker, the presumption is that all employees who are not white-collar workers within the meaning of the law must be classed as manual workers. Nowadays, however, technological progress is constantly raising the level of skills demanded for the types of work done by manual workers and it is no longer possible to base their categorization on the criterion of work involving purely physical effort. Their category now also includes qualified skilled workers (Facharbeiter) who are highly trained and carry corresponding responsibilities. There is no standard regulation of the legal position of manual workers; separate laws cover particular groups, and in practice collective agreements play a very important role in shaping their pay and conditions.