The point of the post is not really to teach articles but to remind all of us to take into consideration reward placement. If I only pay the dog in the place where I want him to be, and if he really wants the reward, why would he go anywhere else. I am creating an expectation that he will be rewarded for the articles or position.
Below is a video clip of an 8 month old malinois pup I am working with. He has never been cued or prompted to down on the articles, I just rewarded him in the manner I described above.