For the purposes of this blog/book, a device is any object whose mechanical and/or electrical workings are controlled or monitored by a microprocessor. In other words, objects that are made up of both hardware and software.
Where The Controls Are
A decision for designers is not just which controls to have, but where to put them: on, near, or remote.
Interaction Models
One of the central tasks of any device designer is to create the interaction model. The interaction model is the overarching framework that ties the functionality together into a unified whole.
Device Differentiators
A differentiator is a characteristic that, all other characteristics being equal, would cause a user to choose one device over another.
A Taxonomy of Device Forms
It helps to consider these device categories, because each brings with it different expectations as to how to engage with the device and what kinds of functionality might be available, not to mention qualities such as durability and cost. Device designers need to be aware of this when considering what form a device should take.