Re-initialize is simply not an option. The rule engine is written so that it knows when to re-evaluate certain constraints. Re-initializing would mean re-evaluting all rules, and considering you could have a huge amount of data, that could be very inefficient. The ruleflow-group does not change anything about how a rule engine behaves normally. It simply makes sure that, if you have a rule-flowgroup specified, those rules will only execute if that ruleflow-group is active. But, as I said, simply calling update(fact) after leaving the ruleflow-group would trigger a re-initialization as you call it, but then only for the constraints related to the fact in question. Kris Quoting liuzhikun <liuzhikun(a)viewhigh.com.cn&gt;: Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm