Ron Ross again brought up the question of “Exceptions to Business Rules” to light (https://lnkd.in/eyemPWF2). Ron defines an exception to the rules as a foreseen, explicit set of circumstances in which different-than-normal guidance is to be followed. He gave an example: seeing-eye dogs as an (explicit) exception to dogs not being allowed in a hospital. One comment says: “I heard that there are no exceptions to the BRs. I heard that there are only other BRs.”

This discussion is still as important as it was years ago when the vendors of Business Rules systems considered a more generic problem of Resolving Conflicts among Business Rules. In 2014, two BR vendors, Drools and OpenRules, independently addressed the problem of the diagnosis and resolution of business rule conflicts using Defeasible Logic. Link