Going deeper (for ages 14-18)

The exclusion principle has a long history in design and strategy.

Steve Jobs at the Apple WWDC in 1997, on cutting most of the product line: "Focusing is about saying no." Three minutes on YouTube. Free. Watch it.

The 37signals book Rework (Jason Fried and David Heinemeier Hansson, 2010) has six short chapters on the say-no principle. About 30 minutes of reading. Probably the best book on this discipline at your stage. Library copy, eBay, or your school library.

Michael Porter (Harvard Business School), 1996 essay "What Is Strategy?": strategy IS deliberate trade-offs. Companies that try to be everything to everyone, in Porter's framing, have no strategy. They have ambition.

The say-no muscle is the most underdeveloped skill in young builders. The kid who can say "no, that's not what we do" at 15 has a real edge over the founder who still can't say it at 35. Most never learn.