Influence diagrams
While the decision making process can have multiple facets, a book about decision making under uncertainty would be incomplete without mentioning influence diagrams (Influence Diagrams for Team Decision Analysis, Decision Analysis 2 (4): 207–228), which help the analysis and understanding of the decision-making process. The decision may be as mundane as selection of the next news article to show to a user in a personalized environment or a complex one as detecting malware on an enterprise network or selecting the next research project.
Depending on the weather she can try and go on a boat trip. We can represent the decision-making process as a diagram. Let's decide whether to take a river boat tour during her stay in Portland, Oregon: