“…Due to the study by Gadermann et al (2010) who used several constructs for testing convergent and discriminant validity—namely optimism (Song, 2003), self-efficacy (Song, 2003), self-concept (Marsh, 1988), depression (Rains, 2003), and empathy (Davis, 1980)—we tried to use comparable constructs that exist as German versions. The present study therefore includes questionnaires for testing convergent validity which also measure self-efficacy (Jerusalem & Schwarzer, 1999) and optimism (Scholler, Fliege, & Klapp, 1999) and additional but related constructs we chose based on previous research (Schmitz, 2016) indicating relationships: life-satisfaction (Athay, Kelley, & Dew-Reeves, 2012), positive and negative affects (Watson, Clark, & Tellegen, 1988), and art-of-living (Lang, Schumacher, & Schmitz, in press). For testing discriminant validity, we included the Big Five (Rammstedt, Kemper, Klein, Beierlein, & Kovaleva, 2013), which has shown correlations to other constructs of positive psychology (cf.…”