Hi, You must make a difference between "facts" and other objects (that you can get by "bindings"). "facts" are the objects inserted in the working memory. Only those objects can be matched directly in LHS. Other entities can be accessed by using attributes (of facts) bindings or "from" constructions to get objects from "facts" fields. And finally, only the "facts" can be modified/inserted/retracted, ie actions that trigger a RETE evaluation and thus new candidate rules to fire. Here, in your first rule, your LHS is matching facts and use a binding $krankheitsbild for a field of KrankheitsbildVonPatient fact. And you are modifying the binded attribute, which is not a fact. So it won't trigger RETE evaluation... To me, it should not compile, but apparently it does .... You can think about 2 corrections : 1 - make your $krankheitsbild objects real facts, ie insert them in the WM, and don't get them via attribute binding 2 - do the set on $krankheitsbild, then "update" your containing fact object ( with update($krankheitsbildVonPatient) ) here are the approximative form of the resulting rules for the 2 approaches : ---------------1------------------- I suppose that Krankheitsbild objects are inserted independently, and your model modified like that declare KrankheitsbildVonPatient patient : Patient end declare Krankheitsbild parent : KrankheitsbildVonPatient abdominaleAdipositas : boolean adipositasGrad : String risikoBegleiterkrankungGrad : int risikoMetabolischeKardiovaskulaereKomplikationen : String metabolischesSyndrom : boolean end so the rule should look like : rule "...." when MessdatenVonPatient($patient : patient && (getMessdaten().getBmi() >= 18.5) && (getMessdaten().getBmi() < 25)) $krankheitsbildVonPatient : KrankheitsbildVonPatient(patient == $patient) $krankheitsbild : Krankheitsbild ( parent == $krankheitsbildVonPatient ) then modify($krankheitsbild){setAdipositasGrad("Normalgewicht"), setRisikoBegleiterkrankungGrad(1) } end ---------------2------------------- May be simpler, but beware of loops ... rule "..." when MessdatenVonPatient($patient : patient && (getMessdaten().getBmi() >= 18.5) && (getMessdaten().getBmi() < 25)) $krankheitsbildVonPatient : KrankheitsbildVonPatient(patient == $patient && $krankheitsbild : krankheitsbild) then $krankheitsbild.setAdipositasGrad("Normalgewicht"); $krankheitsbild.setRisikoBegleiterkrankungGrad(1); update ( $krankheitsbildVonPatient ) ; end De: "wichtl" <irr4ever(a)gmx.net&gt; À: rules-users(a)lists.jboss.org Envoyé: Jeudi 30 Août 2012 15:56:29 Objet: [rules-users] rules not being reconsidered after modify Hi, I'm new to using Drools and its probably just a problem with me understanding how this works, but I've tried everything i can think of, so I come to you in hope for some help! I have a set of rules which modify an object in the RHS and another set of Rules that should be fireing after the modification of the object. Rule modifying the Object: rule "Wenn der BMI des Patienten >= 18.5 und < 25 ist, dann gehört der Patient der Kategorie 'Normalgewicht' an und hat ein 'durchschnittliches' Risiko für Begleiterkrankungen des Übergewichts" when MessdatenVonPatient($patient : patient && (getMessdaten().getBmi() >= 18.5) && (getMessdaten().getBmi() < 25)) $krankheitsbildVonPatient : KrankheitsbildVonPatient(patient == $patient && $krankheitsbild : krankheitsbild) then modify($krankheitsbild){setAdipositasGrad("Normalgewicht"), setRisikoBegleiterkrankungGrad(1) } end Rule that should fire after the modification: rule "Wenn Patient der Kategorie 'Normalgewicht' angehoert, dann werden folgende Maßnahmen vorgeschlagen" when KrankheitsbildVonPatient($patient : patient, krankheitsbild.adipositasGrad == "Normalgewicht") then System.out.println("Some Text"); end Also I have encountered problems (application freezes) when trying to modify the "$krankheitsbildVonPatient" object in the RHS. And I still don't understand why it did freeze and why modifying "$krankheitsbild" does not. Heres my datamodel if needed: http://drools.46999.n3.nabble.com/file/n4019463/dataModel.drl dataModel.drl Best Regards, wichtl -- View this message in context: http://drools.46999.n3.nabble.com/rules-not-being-reconsidered-after-modi... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

Not tried, but this should also be possible: modify( $krankheitsbildVonPatient ){ getKrankheitsbild().setAdipositasGrad("Normalgewicht"), getKrankheitsbild().setRisikoBegleiterkrankungGrad(1) } -W _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users