CRISTAL: Resource Documentation The process of assembling a CRISTAL System information base begins with the visual recording of the subject site and its associated resources. A videographic recording can convey the context or "sense of place" of the site through continuous video images supplemented with an audio account of environmental sounds and verbal commentary. This imagery, sound, and commentary is immediately accessible in the field, providing an instant confirmation of the quality and content of the audio-video document. The video documentation crew works its way around the exterior of the subject building, recording overall views of the structure and the site. Detailed information about materials, joints, evidence of physical condition, unique or significant features, and specific environmental information may be included as part of the video record. The interior of the building may also be recorded using the same strategy. CRISTAL: Introduction CRISTAL: 4 Preservation Issues CRISTAL: Frame Grab