Market segmentation s a natural result of the vast differences among people

The designer has an obligation to provide an appropriate conceptual model for the way that the device works. It doesn't have to completely accurate but it has to be sufficiently accurate that it will help in both the learning of the operation and also dealing with novel situations.

In design it is important to shoe the effect of an action. ... Feedback is critical.

Our information lives will be better served when we are free to get to our information from wherever we are, with any device available.

User-centered design means working with your users all throughout the project.

I think there is a tendency in science to measure what is measurable and to decide that what you cannot measure must be uninteresting.

Good design is also an act of communication between the designer and the user, except that all the communication has to come about by the appearance of the device itself. The device must explain itself.