Twelve years have passed since the publication of Complex Problem Solving: The European Perspective (Frensch & Funke, 1995a). In the volume, most of the prominent European researchers in the area of complex problem solving (CPS) summarized the—then current—state of the field in this relatively young and exciting area of study. As many readers know, CPS is a term that was introduced about 30 years ago in Germany by Dietrich Dörner (1975). Komplexes Problemlösen (which is the original German term) established not only a new type of problem to be studied, a type that differed from “simple” problem solving in terms of complexity, temporal dynamics, and other attributes, but also a new method, namely, the use of computer-simulated microworlds.