During the sprint demo, our product owner asked what happened to the task when it was completed. We explained that it was removed from this list. This was not good. The product owner was hoping that we could provide metrics on tasks further down the road. She would like for us to track the completion of the task instead of deleting it.

After some discussion with the other developers, we have decided the task will gain a completed attribute and be hidden from the list. To accomplish this, we will have to do a bit of refactoring and add new tests. Again, try to complete this exercise on your own and then look at our solution for comparison.