To become a world champion, dogs are judged to FCI standards. The AKC has its own standards, as do some other countries, although most still adhere to FCI standards. The breed standard describes the Dobermann as a dog of medium size that is also strong and muscularly built. Canine intelligence is an umbrella term that encompasses the faculties involved in a wide range of mental tasks, such as learning, problem-solving, and communication. The Doberman Pinscher has been ranked amongst the most intelligent dog breeds in experimental studies and expert evaluations. Psychologist Stanley Coren ranks the Dobermann as the 5th most intelligent dog in the category of obedience command training, based on the selective surveys answered by experienced trainers (as documented in his book The Intelligence of Dogs).