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UI Design is it would work before it is touched - prototypes and mockups
Interaction Design how is it working after i interacted with it - working prototype
UX Design what are my feelings about it
Well im not a UI or UX designer but i am an interaction designer, the subtlety is in the use of the title words:
Lets start with User Interface Design, this is more a software oriented term but can also be used for other forms of human-machine interface in classic hardware industrial applications, it refers to the design of the interface as seen and interacted with by the user, where there is some amount of 'behind-the-scenes' computation done my the machine/software itself on inputs from the user.
User Experience design can also apply to products and services where the experience involved is not just restricted to the visual medium. So UX design can be applied to anything from a customer engagement excercise at a mall to kitchen appliances and other consumer gadgets to even the design of car and home interiors. Usually qualitative evaluations are employed to judge the effectiveness of the design
Interaction Design is an encompassing term that largely refers to human interactions with other entities living and non living objects and conditions in their surrounding environment. I design Culinary Events and Dining Experiences, new ways to eat and experience food. It requires that i understand the different ways people eat their food, the rituals and reasons, habits and gestures, preparation processes and dining procedures. That semantic knowledge must then be applied to designing new ideas. This kind of knowledge and skill is also applied to other forms of interactive art, installation art, new forms of virtual reality and software interaction (like in Minority Report) or event to design samsung's air gesture technology or even to projects like museum design (now going between virtual and physical).
The terms are related and in retrospect, i can say i do use user experience and interface design, albeit in a different medium, but even if one is an interface designer understanding the overall experience and fundamentals of interaction are vital to success in any medium
