Hello! I've googeled and searched the mailing list archive, but i couldn't solve my current problem: Every time i create a new rule (while runtime) i use: PackageBuilder builder = new PackageBuilder(); builder.addPackageFromDrl(source); if(builder.hasErrors()) ... Package pkg = builder.getPackage(); ruleBase.addPackage(pkg); session.fireAllRules(); Every time, fireAllRules is executed, only the last, newest rule will fired. Where is my mistake? ruleBase (and factspace) is created as session = ruleBase.newStatefulSession(); factspace = new FactSpace(session); thanks in advance, michael