Background. Few research studies have been conducted on cancer prevent
ion and control at the workplace. This article presents an overview of
the largest worksite cancer control trial in the United States-The Wo
rking Well Trial-conducted in 114 worksites by four study centers, a c
oordinating center, and the National Cancer Institute. The trial's org
anizational structure, research design, dependent measures, and theore
tical model for intervention are described. Special features of the tr
ial include using the worksite as the unit of randomization, intervent
ion, and evaluation and a theory-driven conceptual model of interventi
on that places emphasis on individual and organizational targets for c
hange, uses the transtheoretical stage of change model to guide a sust
ained 2-year multiple risk factor intervention, and makes use of volun
teer resources within the worksite to reduce cost, increase participat
ion, and improve tailoring to individual needs. The trial will have a
potential impact on over 25,000 workers. Conclusion. The issues raised
in this overview have implications for the evaluation and disseminati
on of cancer prevention and control programs to defined populations. (
C) 1994 Academic Press, Inc.