I just blogged about Types of Design over at the Pivotal Labs blog.
“Design” is a messy word, and describing which type of design you mean can be tricky. Sometimes it’s more helpful to describe types of design not as crisp definitions—”Visual Design looks pretty, and UX has boxes and arrows”—but instead in the spirit of Family Resemblance, i.e.:
things which may be thought to be connected by one things which may be thought to be connected by one essential common feature may in fact be connected by a series of overlapping similarities, where no one feature is common to all.
Check it out, and let me know what you think in the comments!