The average person manages uncertainty on a daily basis, from determining whether to invest in a particular stock to predicting the outcome of a baseball game. However, in some cases, such as that of Boeing safety analysis, the consequences can be much larger. When people’s lives are at stake, effective tools to manage and communicate uncertainty to decision makers are essential. Before being able to visually represent uncertainty effectively, there is a need for understanding where it fits in the analytic process and current methods of visualization.