“…Some investigated the impact of survey stimuli on response quality, such as the size of answer boxes (Behr, Bandilla, Kaczmirek, & Braun, 2014;Christian & Dillman, 2004;Emde & Fuchs, 2012;Israel, 2010;Maloshonok & Terentev, 2016;Smyth, Dillman, Christian, & McBride, 2009), the number of answer boxes (Fuchs, 2009;Hofelich Mohr, Sell, & Lindsay, 2016;Keusch, 2014), the use of motivational sentences Oudejans & Christian, 2010;Smyth et al, 2009), clarification features (Metzler, Kunz, & Fuchs, 2015), examples (Tourangeau, Conrad, Couper, & Ye, 2014), the position of the open-ended question in the web survey (Miller & Lambert, 2014), and counters indicating the number of characters written (Emde & Fuchs, 2012). Other studies investigated the impact of respondents' characteristics such as age, gender, or education (Andrews, 2005;Barrios et al, 2011;Denscombe, 2008;Miller & Lambert, 2014;Smyth et al, 2009;Zuell, Menold, & Körber, 2015). To assess the response quality of open-ended questions in methodological studies such as listed above, but also in other research activities, researchers need to decide on indicators.…”