You know the situation: you’re about to get on an airplane for five hours and you just hope to not get stuck next to the loud snorer or the crying baby. Fortunately for me, my last flight yielded a more interesting fellow traveler.
As I was beginning to nod off around 20,000 feet, I noticed out of the corner of my bleary eyes that my seatmate 
was tapping away on an iPad app that I had never seen before. My fellow flyer was actually using Blueprint, an iOS UI design tool. After striking up a conversation, I learned that the man busy toiling in app interfaces was no master developer but rather a middle school teacher who had an idea or two.
Frustrated with a manual methodology for tracking students in his classroom, he began jotting ideas on napkins on how to make the process more efficient by creating his own app. He tracked down a developer and got to work. After a successful launch in the Apple App Store, my new acquaintance is now on the path to creating his next app. This time though, he is using the more refined method of Blueprint to map out his idea.
This amazes me. The power to create and design apps isn’t just for developers anymore. Now it is within reach of the everyman. No longer can someone sit on the couch, watch a commercial and say, “well, yeah but I thought about that five years ago.” Instead, they can take matters into their own hands (or finger tips!) and start designing.
Now, with the help of tools like Blueprint, App Cooker and iMockups, developers can gain clear guidance from passionate consumers with great ideas. Here’s to the people and the potential for exciting apps in the future.
source: http://blog.utest.com/mastering-ui-for-beginners/2012/07/