Empty your mind, be formless, shapeless… like water.
Now, you put water into a cup, it becomes the cup. You put water into a bottle, it becomes the bottle. You put it in a teapot, it becomes the teapot. Be water, my friend.
The amount of devices and screen sizes continues to increase, so it is ever more important to tailor user experiences for those through adaptive or responsive design techniques.
It is not a daily increase, but a daily decrease. Hack away at the inessentials.
Keep it simple, stupid!. The K.I.S.S. principle states that most systems work best if they are kept simple rather than made complex.
If you spend too much time thinking about a thing, you'll never get it done.
Quick delivery of a working product. Interactions above processes. Collaboration above negotiation. Feedback. Simplicity.
Knowing is not enough, you must apply; willing is not enough, you must do.
Usability tests often provide crucial insights into significant problems and issues related to a given UI or user flow.