Research has revealed that entrepreneurs decide in a causal or effectual way, or use both approaches of decision making. A major concern of scholars and practitioners is to get an understanding, when to decide causal or effectual or use both approaches. In order to get a more fully understanding of the relationship of national culture on effectuation as well as causation, this study explores the influence of Top Management Team’s (TMT) values related to their degree of uncertainty avoidance on both effectual and causal decision making in a corporate context.