This is really neat. Back in the 80s and early 90s, adventure games were pretty much the most popular thing you could play on a computer. Sierra On-Line was arguably at the forefront with its various Quest games, many of which sprung from the minds of Ken and Roberta Williams. What we have here is a vintage featurette that explores what this evolving process of game development was like at the time.
Not only is the video itself old, but it's actually something that's been floating around on the Internet for a number of years. Thanks to Kotaku for shining a spotlight on it again. I'd never seen this before, but it offers a fascinating snapshot of a simpler time for games. One that, when you get right down to it, really wasn't such a long time ago. Oh how far we've come.
If you've never played a Quest game (Police, Space, King's, Quest for Glory, etc.), you should correct that. Collections are available for very little money and they'll run on basically anything with a hard drive, a mouse and a keyboard.