St Anton am Arlberg the Steissbachtal trail just above St. Anton. The groomed runs in the region cater to all levels; 43% are for beginners (blue), 41% for intermediate skiers (red) and 16% are for the more advanced (black). There are also of deep snow runs in the area. Expert terrain includes less-frequently groomed ski routes such as Schindlerkar and Mattun, and the backside of Valluga () down to Zürs, which is for experts only if accompanied by a guide. There are also a large number of off-piste routes in the area that experts can explore with the help of a guide. Other ski
Expert for them to be accepted as an expert. In this respect, a shepherd with 50 years of experience tending flocks would be widely recognized as having complete expertise in the use and training of sheep dogs and the care of sheep. Another example from computer science is that an expert system may be taught by a human and thereafter considered an expert, often outperforming human beings at particular tasks. In law, an expert witness must be recognized by argument and authority. Research in this area attempts to understand the relation between expert knowledge, skills and personal characteristics and exceptional performance.