You might be looking for accumulate or collect patterns. You will find all the information you need in the manual. Best, El jul 30, 2010 11:22 a.m., "Dinesh kumar" <dinp87(a)gmail.com&gt; escribió: Hi, I am facing problems in iterating a list in guvnor. I tried the following code and it worked. import java.util.ArrayList; rule createValidationReport dialect 'java' when ClaimRegistration($ailmentList : ailmentListFromScreen) then for(String ailment : (ArrayList<String>) $ailmentList){ System.out.println("ailment "+ailment); } System.out.println("then"); end But my requirement is to iterate the list in the when block and process something based on the data in the list. It should be something like import java.util.ArrayList; rule createValidationReport dialect 'java' when ClaimRegistration($ailmentList : ailmentListFromScreen) for(String ailment : (ArrayList<String>) $ailmentList){ System.out.println("ailment "+ailment); // My condition needs to be evaluated here } then System.out.println("then"); end Need help on this issue. Is this possible in Drools? kindly advice. Regards, Dinesh -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/How-to-Iterate-list-i... 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