Dan - I nearly said the same about it being a subset, but I'm not sure
it's true (which is why I like your Venn diagram).
I'll be interested to see what you have to say in Designing Gestural
Interfaces because its there that you start to get interaction without
an interface, at least not one that is visible. The two-diagonally-
separating-fingers gesture for zooming up a photo, for example, isn't
an interface at all. It's an action/interaction with the content,
content that also has no other sign or symbol of itself either if it's
a photo taken with, say, the iPhone's built-in camera.
Interface design is the physical manifestation of the interaction
design. They are typically intertwined.
As to why I think interface design is a subset of interaction
design, it is because interface design without the underlying
interaction is graphic design. You can, however, have interaction
design without any interface at all, although it is unlikely.
Best,
Andy
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Andy Polaine
Research | Writing | Strategy
Interaction Concept Design
Education Futures
Twitter: apolaine
Skype: apolaine
http://playpen.polaine.com
http://www.designersreviewofbooks.com
http://www.omnium.net.au
http://www.antirom.com
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