A field of study, which explains why athletes reach their full potential/expertise. Former grad student (olaf) was one of steve nash"s first head coach. Olaf says that steve would put up pylons after practice and practice for hours. Researchers found that anyone who is an expertise has devoted 10 years or/and 10 000 hours of deliberate practice to their specific domain. Deliberate practice is cognitive demanding and effortable: not fun but is necessary for high level skill attainment, necessary for expertise development. Individuals where asked to make a diagnosis based on the. Other was a bored radiologist who has spent over 10 years in the domain. Medical students did not do a good job. They made accurate diagnosis first time and kept it constant. They were able to diagnose instantly, were medical students had to think. If you go to the er, make sure it"s not a medical student; make sure it"s a radiologist or at least the attending physician.