From the Interior Architecture department's page on the Rhode Island School of Design's website:

"Interior Architecture stands at the intersection of architecture, design of the built environment, and conservation. The program addresses the design issues intrinsic to the re-use and transformation of existing structures through an innovative and progressive approach.

Interior Architecture is essentially a spatial art that differs from both architecture and interior design in its full commitment to re-thinking the life of existing buildings-- through design alterations, rehabilitation and adaptive re-use.

At RISD, the program requires that you consider all relevant issues including building structure, systems, and questions of environmental stewardship."

If you are curious about work from the department, please visit: http://intar.risd.edu/