What is good and bad UI?

Traits of a bad UI: Sluggish and unresponsive – interaction will be slow and clunky. Complicated – the site will be hard for people to understand. Confusing – it will be unclear about where the visitor should go next. Inconsistent design – pages will look different, throwing users off.

ATM’s that spit out your card after the cash . ATM users are waiting for one thing: cash. So when the cash dispenses their immediate reaction is to leave. That’s why it’s imperative that the cash comes out last— people are far less likely to forget their card if it comes out before the cash.

So without further ado, here are ten UI design mistakes to avoid at all costs.