Framing IxD knowledge

Interaction design (IxD) research cuts through many domains of HCI yet remains distinctive. There are convincing arguments that Research through Design (RtD) is a valid research method in the concerned field. Important to these arguments is how RtD allows IxD researchers to actually do design as an empirical method to gain knowledge, rather than aligning with the user study tradition. First-order knowledge is crucial to design practice, but it should not overshadow the need for the IxD research community to articulate the many forms of design knowledge that can be extracted from design processes.