Correct errors detected by Smalltalk at run-time. Insert breakpoints in your code to trace it.
Trace changes in the values of objects.
Open the debugger tutorial web page for this lab. Run visualworks simultaneously. Examination and manipulation of the values in the example should give you some hints about the problems with the Account operations. The simple workspace code at the end of the web tutorial might also be useful. Use the debugger to track down the logical errors in the Account class.