Along the same lines, have a boolean attribute called "markedForDeletion" on the fact.  Set it to true and match rules off of that, with a low priority rule that retracts it when all others are done. And if you can't modify the original fact class, like Wolfie says below, insert a control fact that points back to the original, and have rules match off of that: class RetractionHandler {   public OriginalFactClass theDoomedFact; } ________________________________ From: Wolfgang Laun <wolfgang.laun(a)gmail.com&gt; To: Rules Users List <rules-users(a)lists.jboss.org&gt; Sent: Wednesday, October 17, 2012 12:09 PM Subject: Re: [rules-users] How to execute a rule only when a fact is retracted Insert a fact that says "retracted" and write a rule matching that. Or, even simpler, execute whatever is required together with the retraction of that fact. -W On 17/10/2012, dme1 <mehtad(a)hotmail.com&gt; wrote: _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

Thanks for all the suggestions, this really helps. -- View this message in context: http://drools.46999.n3.nabble.com/How-to-execute-a-rule-only-when-a-fact-... Sent from the Drools: User forum mailing list archive at Nabble.com.