If you cannot combine the rules into new rules I would suggest looking at rule flow. _____ From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Chong Minsk Goh Sent: 04 April 2008 10:57 To: rules-users(a)lists.jboss.org Subject: [rules-users] Rules File Design Consideration Hi, Any help to the problem below is much appreciated : ) Here is the problem: I have a set of rules. Intially these rules are evaluated individually. However, now there is a need to fire these rules in groups which is similar to a logic gate AND or OR. And, the results of this "groups of rules" are collected and returned to the user/ For example: There are 4 rules: Rule 1 Rule 2 Rule 3 Rule 4 Now, need to evaluate (Rule 1 AND Rule 2 AND Rule 3) OR Rule 4 And I need to know what are the results of Rule 1 to Rule 4 individually. What is the best way to implement a AND or OR using Drools? Best regards Chong Minsk