Gandalf allows you to define multiple decision tables and to list all decisions that was made. You can use it for anti-fraud, risk management, as part any other decision making purposes.
There are many cases when you need to make decision based on input data. One good example is a decision to approve or decline lending application. You can setup set of cut-off risk rules to decline applications for a high-risk applicants or to use a decision table to specify what categories of users will receive loan on automatic basis.