“…Several articles specifically address its nature (e.g., Cropley, 1990;Flach, 1990;Richards & Kinney, 1990;Schuldberg, 1990), and after introducing a "product" definition, we will begin with these. Many other CRJ articles consider relevant research questions based on noneminent levels of innovation (e.g., AlSabaty & Davis, 1989; Barron & Bradley, 1990;Burke, Chrisler, & Devlin, 1989;Dudek &: Verrault, 1989;Eisenman, 1990;Heinzen, 1989;Hoppe & Kyle, 1990;Rothenberg, 1990;Smith, Michael, & Hocevar, 1990;Smith & van der Meer, 1990). Some will be considered along with the theoretical viewpoints, but the studies of bipolar disorders will be discussed together at the end.…”