I was looking at  Blaze Advisor documentation it has  “when changed” operator that
only fires when an attribute of an object changes. A business analyst
might use it to watch for any important issue, such as a thermostat
warning in a process plant or a particular stock reaching a certain
price or volume.<br><br>In similar way does Drools have this feature?<br><br>Can any one correct if I am wrong: Rules can be updated by business users thru BRMS and Guvnor? (I did not get chance to go thru these)<br>