Another thing to keep in mind is that if you are designing for multiple devices, try to keep the experience the same. With many applications being multi-platform, you don't want the user getting used to an experience on a cellphone that is presented in one way, and then to log on to the computer version, and it's completely different. Therefore, while you are designing the UI, determine how it will look on each device. Is the home icon too small on a cell phone to understand what it is? Is the navigation menu too large for a desktop version? Making sure that the UI is optimized will ensure that users who use your application across multiple devices will have a seamless transition and won't have to try to figure out how to access the features all over again.