Hi Derby, Thank you for responding. I see what you mean. No, I do not have a subroutine called update. At this point, I'm not sure how I should write it. At least I know what's missing. Hopefully, if I can figure out the proper code for the update method, this will all work. I do see your point with the three parameters in the update_cart method versus the two parameters when I call update_cart. That I will need to fix. Thanks for your help. Helen