Film and video cameras are particularly well suited as data gathering technologies for experiments and small group interactions, classroom studies, ethnography, participant observation, oral history, the use of urban space, etc. The tape recorder captures things that are not preserved in even the best researchers' field notes. Similarly, tape recordings preserve audible data not available in even the most carefully annotated transcripts: timbre, the music of a voice, inflection, intonation, grunts and groans, pace, and space convey meanings easily (mis)understood but not easily gleaned from written words alone.