What skills are necessary for the correct interface / interaction / functional design in web applications?

Question

When you develop web applications from scratch, what are the necessary skills to create useful and rich interaction products?

• Do you use a prototype UI first?
• Do you use user stories?
• Some agile methodology or best practices that you recommend or actively advocate?

In short: What skills make you move from collecting requirements for AmazingWebApp ™?

Finally: Any books that you would recommend?

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Avoid specials. When the user asks for something very specific, be careful. Always doubt your prejudice and see if it really makes your product better.

Prototype Don't wait for the launch to show what you have for the user. Frequent prototypes (you can even call them beta versions) and receive constant feedback throughout the development process. You will probably find more requirements on how you do this.