Trump: The Art of the Deal also contains an 11-step formula for business success, inspired by Norman Vincent Peale's "The Power of Positive Thinking". Trump was persuaded to produce the book by Condé Nast owner Si Newhouse after the May 1984 issue of Newhouse's magazine "GQ" – with Trump appearing on the cover – sold well. Schwartz was hired to work on the book, and began working with Trump in late 1985. He interviewed Trump and – with permission from him – listened in on his phone calls. According to Schwartz in July 2016, Trump wrote none of the book, choosing only to remove a few
Positive adult development and Langer (1990). Four postformal adult stages of development beyond the formal stage have been discovered in a wide variety of domains. The total number of stages across the life span now stands at 15. Periods and Seasons have been described. For critical discussion of term postformal thinking, see Kallio (2011). She claims that highest forms of adult cognitive development (as part of adult positive development) can be called as integrative thinking (i.e. integrating several different psychological domains as emotions, cognition etc.). A number of edited books were written on the topic of positive adult development in the 1990s (Commons,