In Section 1 of this article, the author discusses the succession of models of adult writing that he and his colleagues have proposed from 1980 to the present. He notes the most important changes that differentiate earlier and later models and discusses reasons for the changes. In Section 2, he describes his recent efforts to model young…

The famed playwright Harold Pinter, having just been introduced as a very good writer, was once asked by a six-year-old boy if he could do a "w." The author suspects that "w" was a difficult letter for this young man, and he judged the writing capability of others accordingly. This student's assumption--that being a "good…