“…Although selfreport questionnaires have advantages-such as the ability to present a large number of questions on a wide range of skills in a short time, simple scoring, fast processing, and cost effectiveness (Kuhlemeier & Hemker, 2007)-this method has significant problems of validity (Hakkarainen et al, 2000;Hargittai, 2005;McCourt, Larres, Ballantine, & Whittington, 2003;Merritt, Smith, & Renzo, 2005;Talja, 2005). Interpretations of skills are perspective and context dependent (Talja, 2005). Talja introduced the concept "Information Technology-self" (IT-self), which is a dialogic, context-dependent, momentary, and multilayered entity involving different temporal layers with which people refer to their past experiences but also predict future levels of skills.…”