What is design research?

Was helping a friend earlier today put together a list of resources describing what design research is. Including, how it's different from market research...

If you ever needed to know, reference these:
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Design Research: A Disciplined Conversation - Nigel Cross
Design Issues, Vol. 15, No. 2, Design Research (Summer, 1999), pp. 5-10

This journal can be great, but also way too theoretical. This article is worth looking at HERE.
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Brenda Laurel's book, Design Research

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Design research: building the knowledge base
Charles L. Owen - Institute of Design

Lots of theory, but you might find something of use here.
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Theory construction in design research: criteria: approaches, and methods
K Friedman - Design Studies, 2003 - w3.msi.vxu.se

Some juicy nuggets/talking points at the beginning of the article.
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Researching Design and Designing Research - Ranulph Glanville
Design Issues, Vol. 15, No. 2, Design Research (Summer, 1999), pp. 80-91
Find a summary of the article HERE. Related article HERE.

Great depiction of how design research began, or why it began.