In the world of creation—whether you’re building a mobile app, a medical device, or a new kitchen gadget—there is a dangerous gap between a "great idea" and a "great product." That gap is where most projects fail. The bridge across it?

Why go through the trouble? Because schematics lie. Spreadsheets lie. CAD models lie. Gravity, friction, and human stupidity do not. The prototype serves three indispensable functions.

Do not test a functional prototype for durability with a graphic designer. Do not test a visual prototype for color with a mechanical engineer. Match the prototype to the expert. And for gods sake, do not ask your mother to test anything—she loves you too much to criticize you.