Abstract: A rule based compatibility module provides a single unified mechanism for testing rules where testing results depend on various combinations of database queries, computable values, and/or run-string parameters. The testing results may be evaluated within a particular operational environment. The rule based compatibility module encapsulates all versions of compatibility issues, which are highly dependant on the operational context, into one simple mechanism, thereby reducing risks of unexpected behaviors caused by improper or incomplete handling of compatibility issues. In addition, the rule based compatibility module provides a simple mechanism for handling ad-hoc run-string switches used for debugging, or for optional enabling or disabling of features under development.