hi, I have no problem for this kind of rule : rule "Primitive support" when $c : Cheese( price < 10 ) then $c.setPrice( 10 ) end but I would like to know what is the decision table for this small rule rule "Primitive support" when $c : Cheese( $price : price ) then $c.setPrice( $price * 2 ) end I've tried a lot of syntax and I read the section abour the decision table in the manual but ididnt find anything. _________________________________________________________________ Créez votre disque dur virtuel Windows Live SkyDrive, 5Go de stockage gratuit ! http://www.windowslive.fr/skydrive/