Re: [rules-users] Evaluate rules for multiple facts of the same type within a StateuflSession

laune wrote I'll try to summarize them as properly as I can... Rule 0: default condition If cart is paid "offline", it has 0% discount Rule 1: online payment discount If cart is paid "online", it has 10% discount These two are fixed and always valid. Then we monthly decide a list of items that grant different discounts on the whole cart over the 10% of Rule 1 (i.e. Rule 1 must be true to get further discount). For example: Rule 2: valid for February 2013, item A If cart is paid "online" and contains item A, it has 15% discount Rule 3: valid for February 2013, item B If cart is paid "online" and contains item B, it has 17% discount Next month, both items and discount levels will change We need the firt Rule 0 because the user can change the payment method, so we have to reset the discount to 0. Ideally, we would like to left the Rule 0 and 1 unchanged (as they are basic rule) and manage the monthly rules without impact on them. To make things worse, our business people not only rely on items contained in the cart, but each month they decide a different attribute from the cart or user to be taken into account for special discount, so that the examples above may read like: Rule 2: valid for February 2013, item A If cart is paid "online" and contains item A and the user is older than 30, it has 15% discount Rule 3: valid for February 2013, item B If cart is paid "online" and contains item B and the cart is shipped within Europe, it has 17% discount As you remember, we used salience and activation groups, but this prevents us from applying rules to a bunch of carts, as the rule activation cancels other activations. Do you see a cleaner design? Thank you a lot for support. -- View this message in context: http://drools.46999.n3.nabble.com/Evaluate-rules-for-multiple-facts-of-th... Sent from the Drools: User forum mailing list archive at Nabble.com.