The following contributors are gratefully acknowledged for their efforts on this document: Roger R. Rosa, Ph.D. (NIOSH, Office of the Director, Senior Scientist), Steven L. Sauter, Ph.D. (NIOSH, Division of Applied Research and Technology (DART), Chief, Organizational Sciences and Human Factors Branch), Thomas R. Waters, Ph.D., C.P.E. (NIOSH, DART, Supervisory Industrial Engineer), and B.K. Nelson, Ph.D. (NIOSH, DART, Research Toxicologist).

Editorial review by Anne L. Votaw, Writer/Editor, NIOSH, DART.
Document layout by Brenda J. Jones, Visual Information Specialist, NIOSH, DART.

Credits for cover photos:

Nighttime Lights of the USA. Satellite imagery: U.S. Air Force and the National Oceanic and Atmospheric Administration.

Foundry worker and assembly worker: Parker D.L. [2002]. By These Hands. St. Paul, MN: Minnesota Historical Society Press.

Medical worker: http://www.corbis.com. Worker at a computer: Brenda Jones, Visual Information Specialist, NIOSH, DART.

We thank the following external reviewers of this document.

Index: Main Page Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 Table 9 Abbreviations Acknowledgments Introduction Description of Work Schedules and Samples Health and Safety Findings Summary Concluding Remarks References