I've lost count of how many times I've done this: standing like an idiot before a door with a handle screaming "PULL ME!" while a tiny sign says "push." We all have. Don Norman, the User Experience (UX) legend, labeled this a "Norman Door": design so bad it needs instructions to use.

And I'm here to tell you: Your product might be a Norman Door.

In my years as a product manager, from enterprise to small business software, I've cringed watching users struggle with prototypes my team swore were intuitive. This door problem isn't abstract design theory. It's a product disease that's bleeding your conversion rates dry.

Related: The 10 Obstacles Keeping You From Great Product Design

When I first learned about affordances, visual cues showing how something works, it seemed like design-school fluff. Then I watched a user test where people couldn't find our "obviously placed" save button, and suddenly Don Norman didn't seem so theoretical.

Take Robinhood's original interface. While dinosaur brokerages buried users in cavernous websites, Robinhood stripped investing to its essentials: up means good, green equals money, swipe........

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