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 psychology for someone of low skills results in a state of anxiety; insufficient challenge for someone highly skilled results in boredom. Research in positive psychology, well-being, eudaimonia and happiness, and the theories of Diener, Ryff, Keyes and Seligman cover a broad range of topics including "the biological, personal, relational, institutional, cultural, and global dimensions of life". A meta-analysis on 49 studies in 2009 showed that Positive Psychology Interventions (PPI) produced improvements in well-being and lower depression levels, the PPIs studied included writing gratitude letters, learning optimistic thinking, replaying positive life experiences and socializing with others. In a later meta-analysis of 39