On the disc the critic Jeffrey Lyons says that Welles made "The Stranger" primarily to prove he could bring a project in on time and within budget.
"But my aim was primarily to prove that you could bring a group of people together on the Internet and create good work".
Money was lavished on the moon-shot primarily to prove which system communist and restricted, or capitalist and free would prevail.
And like so many rich girls of fiction, 12-year-old Grace (Mae Whitman) exists primarily to prove how emotionally rich, full and loving the lives of the less-than-wealthy really are.
Malpractice awards do drive up insurance premiums for doctors in high-risk specialties, and there is some evidence that doctors engage in "defensive medicine" by performing tests and treatments primarily to prove they are not negligent should they get sued.
The Equifax breach shows us a few things but primarily it proves that the systems put in place to protect banks from customers are inefficient and prone to catastrophic failure.
Bahrain's motives for participating in the anti-Islamic State campaign are primarily to prove its commitment to both its Saudi backers and the West, Slim said.
The true winner of the Iowa Caucus was Bernie Sanders, primarily because he proved that Clinton needed luck, and a complicated electoral process, just to achieve a draw.
A diet diary has also been used to distinguish children whose intake of fresh produce and juices was primarily organic and proved effective in classifying children's OP pesticide exposure (Curl et al. 2003a).
