There is much research to be done before a coherent understanding is achieved of the interplay between factors involved in naturalistic decision making, particularly when it comes to personal decision making, i.e., relatively important decisions which people make in their private lives (Willén, 1994; Wolham, 1982). With a few exceptions, naturalistic studies have been limited to professional decision making (e.g., Klein et al., 1993). The exceptional studies include research on adolescents’ decision making (Fischhoff 1996), the decision to have a child (Willén, 1994), and different kinds of personal decisions (Karlsson, 1988).