As variance studies, approaches one and four offer deterministic explanations of decision-making. Approaches two and three, as simple and complex process approaches (Tsoukas, 2005), deliver much richer explanation of causation of events. The simplicity of approach two is attributed to its commonly historical approach and the simplification complex events that is conventional in such studies. The complexity of approach three lies in its direct observation and rich reporting of experiences. By nature of their explanation of causation, approaches one and four will always produce chronically underdetermined theories. Approach two offers a marked improvement in the identification of distal causation, but the explanatory power of such theories isundermined by oversimplification of complexity. As with any scientific endeavour, under the doctrine of ontological relativism, for any collection of evidence there will always be many theories able to account for it (Quine, 1969). However, if the richest explanations of decision- making events follow approach three, then we argue that this is where we should be looking to improve our understanding of tourists’ decision-making.