=+1. An interesting case study of skill acquisition was reported by Ohlsson (1992), who looked at the development of Isaac Asimov’s writing skill. Asimov was one of the most prolific authors of our time, writing approximately 500 books in a career that spanned 40 years. Reportedly, he sat down at his keyboard every day at 7:30 a.m. and wrote until 10:00 p.m. Figure