Here is the test - the one I fail frequently. Given a problem, how do you solve it? Often, too often, I get a solution for one part of the overall problem quickly, and zero in on it. I then create a solution for that part of the problem, but have one, unconnected part. It hangs around - orphaned from the complete solution which is required.
I have failed the gumball test. I tried eating the gumball from the inside out - solving the problem from the inside out. The solution, as always, is to start on the outside.