Here are two possible benefits of having developers execute the test cases while the tester watches:

1. The developer learns more about the actual testing process, and may end up being easier to work with.

2. The tester may be exposed to power-user techniques, and become a more efficient user of the system.

  9:24:06 AM    

Well, duh! But I'm thinking more along the lines of presenting time/effort estimates of the testing process to project management.

If it takes 10 minutes to run a test case from scratch to completion, and there are 6 test cases, then it will take 1 hour to run all the test cases.

If there are no defects found.

Let's say that it takes 20 minutes to write up a bug, and between 5-20 minutes to research it. Severe bugs take 2x time (on average), and trivial bugs take .5x time.

So, using these made-up numbers, each trivial bug found adds 20 minutes to the total test time, each average bug adds 40 minutes, and each severe bug adds 80 minutes.   9:19:44 AM