b) Next, develop conditional "can do if" scenarios 
                  Routine tasks to be carried out under 
                certain conditions 
              c) Finally, record "might do" scenarios ("abuse 
                cases") to test flexibility 
                  Exceptions -- unusual, complex, difficult 
                to handle cases     Help uncover poor collaborations 
                and clarify system scope     (a stress test) 
              
                  ATM example: withdrawal with insufficient 
                funds