Hi Doug: Pengcheng writes: If the traversal is to be stopped at a object of class 'A', can we write the traversal stratege as from the root to the super class of A. Can it reach the A object? I tested this out with DJ in: /proj/adaptive2/course/com1205/f00/hw/prepare/stop-at-super and I don't understand why I get two B printed? Running the test... c A printed c B printed c B printed And I don't understand the output when I delete the comment in super.beh. Why does it go to a C-object? Please can you check whether this is a bug or whether I have some misunderstanding. -- Karl