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Successful ideas usually have all three of the following: great design, great business and a great story.
It's hard to conceptualize and design ideas that do have all three, but that's the goal. It bothers me when people say "ideas are easy" because they're not, at least not good ideas. To design and execute them well is really hard.
How would you know if you've made it?
You've been inspired by and designed for the experience of the user.
You've designed a business system that reinforces that user experience and stands out positively in the marketplace.
You've told a compelling story that connects with the user.
Then you have to get your audience of, often cynical and skeptical colleagues, to be as confident as you are to do the next thing in the chain (prototype, design, prototype, pilot, launch, re-launch, fund, etc.)
The metaphor we've been playing with at work is one of a car (I'm not a car guy, so it's kind of weird to use it). You need great aesthetic styling, you need a great engine and you need a great story of the development of that car and what it's going to do for you. The styling and engine can help tell the story, but so can more overt methods and design details.
How good is your idea? How does the car look and make you feel? Is the engine there for the user and your business? Do folks understand what it is and where it comes from and why it's for them?