This is a 120 item measure of crystallized intelligence (gc), more precisely, declarative knowledge. Based on previous findings concerning the dimensionality of gc (Steger et al., 2019), we sampled items from four broad knowledge areas - humanities, life sciences, natural sciences, and social sciences. Each knowledge area contained three domains with ten items each, resulting in a total of 120 items. Items were selected to have a wide range of difficulty and to broadly and deeply cover the content domain. Items are available in German and English. The development of the inital item pool is detailed in Steger et al. (2019). We used and described the 120 item gc measure in a recent publication (Schroeders et al., 2021) and a preprint (Watrin et al., 2021). To avoid item exposure: If you are an interested researcher, please drop me a line and I’ll provide you access (schroeders[at]psychologie.uni-kassel[dot]de).
There is also a ultra-short version in German, BEFKI gc-K, with a testing time of 5 min. It comprises of 12 multiple-choice items, 4 items for the knowledge areas humanities, natural sciences, and social sciences. The test construction has been described in Schipolowski et al., 2013 and Schipolowski et al., 2014. In short, it is a unidimensional gc measure that has been presented to a nationally representative sample of 1,134 German adults. For more details on reliability and validity see Schipolowski et al., 2013. Again, to avoid item exposure: If you are an interested researcher, please drop me a line and I’ll provide you access (schroeders[at]psychologie.uni-kassel[dot]de).