Is it possible write conditions on the basis of size of a list using guided editors (either guided decision table or guided rule) and to check if any element is present in the list? For eg. User { List of badges; } now I want to apply condition on number of badges and if a specific badge is in user's list of badges. Also can I compare to objects. For eg. condition on count of badges of two users? I'm using KIE Drools Workbench Here's how source code should look like :- import com.demo.dto.User; import com.demo.dto.Badge; rule "Compare two variables" when $user: User(name == "Sam") $badge: Badge() memberOf $user.getBadges() then $user.setImpact($user.getImpact + $user.getBadges().size()) -- View this message in context: http://drools.46999.n3.nabble.com/Size-and-contains-methods-of-List-in-Dr... Sent from the Drools: User forum mailing list archive at Nabble.com.