Mo Duffy is a senior interaction designer at Red Hat, a billion dollar company that is the world's leading open source and Linux provider. I met Mo this past spring when we spoke on a panel at SxSW. I was struck by her insights into her profession and how those insights relate to all design professions. Not only does she get into the nitty gritty of the politics of the workplace and the realities of usability testing, but she is a passionate advocate for open source and the democratization of design.

Xanthe Matychak: How do you define Interaction Design?

Mo Duffy: I define interaction design to mean the design of systems and interfaces where humans and computers interact with each other, and, more importantly, where human beings interact with each other mediated by computer systems.

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