This is a modified sample of the work done by www.baeldung.com, credit goes to them.
Decision tables are a "precise yet compact" (ref. Wikipedia) way of representing conditional logic, and are well suited to business level rules.
Drools supports managing rules in a spreadsheet format. Supported formats are Excel (XLS), and CSV, which means that a variety of spreadsheet programs can be used for defining the business rules.
The Tutorial Guide can be found under dev.cloudburo.net