Hi all, I'm having difficulty in defining a rule for the following problem: We need to check if within a week there are more than 5 objects of type Reminder inserted into Memory. (one day corresponds to one object) The number of the inserted objects depends on the usage of the application. That means there could be nothing, 1, 2, or any number of the objects. Before, within a session, I inserted a list containg data from within one week (7 days). Than I can check using the rule: when: $list : list(size > 5) Reminder() from $list no String(trim == "limit reached"); then System.out.println("This rule fires"); insert new String("limit reached"); Now I need to insert a list containing data from a whole month, but I still need to check whether within one week there are more than 5 reminders exist. so, the constraint list> 5 can't be used anymore for a single list. I tried to break the whole list in several smaller list, where each list represents one week. Now the problem is, if the rule fires for a certain week, than it won't work for the following weeks anymore. My idea is then to insert an integer containing specific number to the current list, i.e. the calendar week (i.e insert new Integer(52)) and then to prove this in LHS; but the problem is now how to prove the week number in LHS? as I remeber, a function can only be called within an eval statement and in this case actually I should only prove the existence of an Integer Hope my explanation is quite understandable and looking forward for any hints Regards -- View this message in context: http://www.nabble.com/need-some-advice-in-defining-rules-tp23259683p23259... Sent from the drools - user mailing list archive at Nabble.com.