A typical sign-up form contains a couple of form fields (it seems like the most popular number nowadays is 3: e-mail, password and a peculiar “repeat password”) and a button. Is there anything to design in this minimalistic structure? Isn’t it too simple to focus on?

Unfortunately, many non-designers and some designers think exactly this way. If it’s visually simple (and tiny!), it shouldn’t be designed, as it would be a waste of time, right? Completely wrong.

Source: http://designmodo.com/ux-sign-up-form/#ixzz2LqV9YgHn