“…Our IPSE approach is based on a cognitive science oriented theory of knowledge acquisition, the ISP-DL Theory (Impasse -Success -Problem Solving -Driven Learning Theory; Möbus, Schröder & Thole, 1994). The theory attempts to integrate impasse-driven learning (Laird, Rosenbloom, & Newell, 1986;Newell, 1990;van Lehn, 1988;1991), success driven learning (e. g., Anderson, 1983;, and phases of problem solving (Gollwitzer, 1990;Heckhausen, 1989). According to the theory, the student will look for and appreciate help if he is caught in an impasse.…”