... Accordingly, the students develop implicit theories or mindsets which may stress an entity view of more or less fixed and unchangeable abilities -or an incremental view of more or less modifiable and changeable abilities (Dweck & Leggett, 1988;Yeager & Dweck, 2012). Though these implicit theories have been demonstrated to correlate with the student's actual ability level only marginally (Spinath, Spinath, Riemann, & Angleitner, 2003), they significantly affect their motivationally relevant goal orientations, effort beliefs, learning strategies and, eventually, their task performance (Blackwell, Trzesniewski, & Dweck, 2007;Burnette, O'Boyle, VanEpps, Pollack, & Finkel, 2013;Cury, DaFonseca, Zahn, & Elliot, 2008;Jones, Wilkins, Long, & Wang, 2012). These implicit theories principally might not only concern an individual's cognitive ability but also might emerge in a domain-specific manner and refer to the perceived malleability of certain skills or competencies (Dweck & Molden, 2005) -e.g., in the areas of mathematics and language (Davis, Burnette, Allison, & Stone, 2011;Räty, Kasanen, Kliskinen, Nykky, & Atjonen, 2004;Vogler & Bakken, 2007), foreign language learning (Lou & Noels, 2017), academic writing (Karlen & Compagnoni, 2017), music (Smith, 2005), physical activities (Ommundsen, 2003), biology and science (Chen & Pajares, 2010;Dai & Cromley, 2014). ...