You can achieve a high-quality user interface by combining 3 design process models:
Although you should apply the methods in the above list’s sequence, I’ll discuss them in the opposite order here.
All 3 methods share one basic idea: there’s no one perfect user interface design, and you can’t get good usability by simply shipping your one best idea. You have to try (and test) multiple design ideas . Competitive, parallel, and iterative testing are simply 3 different ways to consider design alternatives. By combining them, you get wide diversity at a lower cost than simply sticking to a single approach.