Tests used for neurobehavioral assessment in worksite studies sponsored by NIOSH were reviewed. Eleven worksite studies involving neurobehavioral assessments of workers were cited, including some that had not previously been published in the open literature. Study topics included the behavioral and neurological evaluation of workers exposed to inorganic mercury (7439976); a field evaluation of carbon-monoxide (630080) exposure among toll collectors; behavioral function evaluations of lead (7439921) exposed workers; the behavioral and neurological effects of methyl-chloride (74873), carbon-disulfide (75150), and perchloroethylene (127184); the irritant effects of formaldehyde (50000); the behavioral and neurological effects of inorganic lead; a survey of leptophos (21609905) pesticide workers; and a neurobehavioral examination of the workers in a primary nonferrous smelter. Specific tests for sensory, motor, cognitive, and affective functions were described and compared. Test selection was dependent on whether the purpose of the study was to assess chronic chemical exposures in workers, to compare chronic exposures among workers to acute laboratory exposure effects, to identify exposures in a particular facility, or to determine indicators for a specific chemical. Individual and group differences for the tests were discussed with regard to their usefulness in field settings, low exposure levels, sample size, and inherent problems associated with epidemiologic studies.