Experts, on the other hand, have internalised the necessary knowledge so they don't have to actively remember rules or think consciously about their choices. They have acquired enough experience in various situations to be able to rely on their intuition to know what to do in which kind of situation. Their decisions in complex situations are explicitly not made by long rational-analytical considerations, but rather come from the gut (cf. Gigerenzer, 2008a, 2008b).