The Pan-American Course on the Conservation and Management of Earthen Architectural and Archaeological Heritage (known as PAT), held in the 1990s in Peru. Part of Project Terra—a collaborative project of the GCI, ICCROM, and CRATerre-EAG—the PAT course provided training for professionals in the conservation and management of the earthen architectural heritage. The course included curricula, didactic materials, and methods that blended the social, cultural, and technical aspects of earthen architecture. Photo: Erica Avrami.