When developmentalists use the term "expert," they usually mean a person who _____. question 20 options: a.has earned advanced credentials in his or her special area?

• andriansp: I believe the answer is: is significantly better than others at performing a certain task
  
  Developmentalist believe that a strong skill set is aquired through repeating a certain action over and over again to the point where that person could perform a certain task in significantly better quality compared to other people.
  According to these developmentalists, in order to be a world class expert in a certain thing, you need to at least put 10,000 hours of effort into that task.