If I were you, I'd use something like Global java.lang.Integer cnt; Rule "before everything" Salience 10 When Eval(true) Then Cnt=0 End Rule "condition A" When condition A Then cnt=cnt+1; End Rule "condition B" When condition B Then cnt=cnt+1; End Rule "condition C" When condition B Then cnt=cnt+1; End Rule "action 1, after everything" Salience -10 When eval(cnt>=2) Then execute action 1 End Of course, if you change the fact, you'll probably have to think about things like lock-on-active to increment only one time the cnt variable -----Message d'origine----- De : rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] De la part de skasab2s Envoyé : jeudi 3 juin 2010 14:04 À : rules-users(a)lists.jboss.org Objet : [rules-users] Firing a rule if at least its two conditions are satified Hello, we are using Drools in our company. We have a rule with three conditions in this format: when Condition A Condition B Condition C then execute Action 1 Now we have a situation, in which the rule should fire if AT LEAST two of the three conditions are satisfied. Do you know how to implement this? Any ideas or hints? Many thanks and regards! skasab2s. -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Firing-a-rule-if-at-l... Sent from the Drools - User mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users This message contains information that may be privileged or confidential and is the property of the Capgemini Group. It is intended only for the person to whom it is addressed. If you are not the intended recipient, you are not authorized to read, print, retain, copy, disseminate, distribute, or use this message or any part thereof. If you receive this message in error, please notify the sender immediately and delete all copies of this message.

A better approach is probably to split up the conditions from action. Each condition would be a separate rule which would use insertLogically to insert a new object. Then have another rule which accumulates and counts how many of these objects exist in the working memory. If the count is >= 2 then perform the action. Thomas From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Tihomir Surdilovic Sent: 03 June 2010 13:40 To: rules-users(a)lists.jboss.org Subject: Re: [rules-users] Firing a rule if at least its two conditions are satified IMO you can just use activation groups and not have to deal with incrementing, something like: rule first activation-group "myactgrp" when Condition A Condition B then ... end rule second activation-group "myactgrp" when Condition A Condition C then ... end rule third activation-group "myactgrp" when Condition B Condition C then ... end When one of these rules fire it will cancel the activation of all other rules in the same activation group. You can also then add salience to control rule priority. On 6/3/10 8:15 AM, PAYET, Manuel wrote: If I were you, I'd use something like Global java.lang.Integer cnt; Rule "before everything" Salience 10 When Eval(true) Then Cnt=0 End Rule "condition A" When condition A Then cnt=cnt+1; End Rule "condition B" When condition B Then cnt=cnt+1; End Rule "condition C" When condition B Then cnt=cnt+1; End Rule "action 1, after everything" Salience -10 When eval(cnt>=2) Then execute action 1 End Of course, if you change the fact, you'll probably have to think about things like lock-on-active to increment only one time the cnt variable -----Message d'origine----- De : rules-users-bounces@lists.jboss.org<mailto:rules-users-bounces@lists.jboss.org> [mailto:rules-users-bounces@lists.jboss.org] De la part de skasab2s Envoyé : jeudi 3 juin 2010 14:04 À : rules-users@lists.jboss.org<mailto:rules-users@lists.jboss.org> Objet : [rules-users] Firing a rule if at least its two conditions are satified Hello, we are using Drools in our company. We have a rule with three conditions in this format: when Condition A Condition B Condition C then execute Action 1 Now we have a situation, in which the rule should fire if AT LEAST two of the three conditions are satisfied. Do you know how to implement this? Any ideas or hints? Many thanks and regards! skasab2s. -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Firing-a-rule-if-at-l... Sent from the Drools - User mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users@lists.jboss.org<mailto:rules-users@lists.jboss.org> https://lists.jboss.org/mailman/listinfo/rules-users This message contains information that may be privileged or confidential and is the property of the Capgemini Group. It is intended only for the person to whom it is addressed. If you are not the intended recipient, you are not authorized to read, print, retain, copy, disseminate, distribute, or use this message or any part thereof. If you receive this message in error, please notify the sender immediately and delete all copies of this message. _______________________________________________ rules-users mailing list rules-users@lists.jboss.org<mailto:rules-users@lists.jboss.org> https://lists.jboss.org/mailman/listinfo/rules-users ________________________________ ************************************************************************************** This message is confidential and intended only for the addressee. If you have received this message in error, please immediately notify the postmaster(a)nds.com and delete it from your system as well as any copies. The content of e-mails as well as traffic data may be monitored by NDS for employment and security purposes. To protect the environment please do not print this e-mail unless necessary. NDS Limited. Registered Office: One London Road, Staines, Middlesex, TW18 4EX, United Kingdom. A company registered in England and Wales. Registered no. 3080780. VAT no. GB 603 8808 40-00 **************************************************************************************

I had to do something like this. The way I did it is by prividing a method in my object in working memory that takes multiple Boolean conditions and loops through them and return true if at least N of the conditions were true. So, this funtions will take N and a list of all conditions. Then it returns true or false. So, your eval will look like this: eval(obj.atLeastNTrue(n, conditionA, conditionB, conditionC, etc)) Sent from my iPhone On Jun 3, 2010, at 7:03 AM, skasab2s <skasab2s(a)smail.inf.fh-brs.de&gt; wrote: