[rules-users] Different working memories/rulebases for different application issues?

Hi, I'm quite a beginner with Drools and I want to integrate Drools in our application. The application could use rules for different smaller issues which use partly different facts as input. My question is if I should use different rulebases or working memories for each issue or is on rulesbase contiaining all rules which then refers to different fact tyes and one session is enough? does it make sense to bundle the rules for each issue in an own agenda group? Regards Thomas