Use of the term multiple chemical sensitivity (MCS) as a diagnostic label has generated increasing controversy during the past few decades as a phenomenon related to exposure to chemical agents sustained both in indoor and outdoor environments. This volume, prepared in conjunction with Biologic Markers in Immunotoxicology , contains the authored papers of a workshop held to develop an agenda to study the phenomenon of multiple chemical sensitivity. Authored by clinicians, immunologists, toxicologists, epidemiologists, psychiatrists, psychologists, and others involved in research or clinical activities relevant to the problem, the papers contain case evaluations and criteria for diagnosis, mechanisms potentially underlying MCS, and epidemiologic approaches to investigation.