I'm still going through Paul Browne's "JBoss Drools Business Rules" and am using test scenarios now. What I've noticed is the activation counts displayed on different parts of the screen don't match. As per the book, I originally had a value for "sales" that would fire the rule 11 times, then changed the rule to have "no-loop true". Re-running the test gives the correct 1 activation at the top, but in 2 other places the old 11 count is still displayed. I also noticed this behavior when changing the test scenario value of "sales" - for example, I'd start with a value that would fire 3 times, then change it to one that would fire 11 times. In the second case, 11 would correctly show at the top, but 3 would incorrectly display in 2 places lower down.