In a nutshell, the King's Keys deck started as an experiment to see what card games would be like if you rebuilt playing cards from the ground up. Instead of using ranks and suits, each card has a number (from one to four), one of four items, and one of four colors. The result is what I call a 4x4x4 deck where 64 playing cards each have a unique combination of these three parts.

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The Viet Nam era draft card is also known by its legal description, the status card. The draft card was an aspect of the Selective Service Act, the federal legislation that legalized the conscription of eligible males into the American armed services during the Viet Nam war (1962–1973).

The team used a whiteboard with task cards, stand-up meetings, weekly iterations, and prioritization. They even estimated their work, measured flow, and held retrospectives.