These tutorial presentations, authored by Nicolai Marquardt, cover the principles of sketching and their use. While there is overlap between them, their audience, style and contents do differ so its worth perusing (and perhaps remixing) their contents for your own use.
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The Tutorials
Interaction Design: Sketching Interaction – a University guest lecture
Sketching User Experiences: Stories, Strategies, Surfaces – an industry-oriented tutorial
