a d va n c i n g s c i e n c e a n d p r o m o t i n g u n d e r s t a n d i n g o f t r a u m at i c s t r e s s Throughout human history the theme of positive changes following adversity is found in literature, religions, and philosophies. Most notable is Nietzsche's famous dictum, "What doesn't kill me makes me stronger." It was an idea also common to the existential and humanistic traditions of psychology of the mid-twentieth century. Viktor Frankl wrote about the will to meaning following his experiences in Theresienstadt and Auschwitz, and Abraham Maslow noted that confrontations with tragedy were often precursors to self-actualization. Scientific interest was sparked when a handful of studies appeared in the late 1980s and early 1990s, reporting positive changes in, for example, rape survivors (Burt & Katz, 1987), male cardiac patients (Affleck, Tennen, Croog, & Levine, 1987), bereaved adults (Edmonds & Hooker, 1992), and combat veterans (Elder & Clipp, 1989). Interest took hold during the 1990s as the construct was elaborated (e.g., O'Leary & Ickovics, 1995; Tedeschi & Calhoun, 1995) and with the emergence of several psychometric self-report tools, the Changes in Outlook Questionnaire (CiOQ: Joseph, Williams, & Yule, 1993), the Posttraumatic Growth Inventory (PTGI: Tedeschi & Calhoun, 1996), the Stress-Related Growth Scale (SRGS: Park, Cohen, & Murch, 1996), the Perceived Benefit Scales (PBS: McMillen & Fisher, 1998), and the Thriving Scale (TS: Abraido-Lanza et al., 1998). But it is only over the past decade, bolstered by the new positive psychology movement, that the topic has become firmly established as a field of scientific research and clinical interest. Recent major texts include Calhoun and Tedeschi's (2006) Handbook of Post-traumatic Growth, and Joseph and Linley's (2008) Trauma, Recovery and Growth.