Slide 8 of 15
The organization based sampling strategy is not a blind sampling procedure. The procedure targets the most likely worst-case exposure candidates by using the organizational constraints of worker job assignments as well as information about noise sources and the degree of repetitiveness of the job assignments. The procedure starts by defining the organizational limits on a worker job assignment. This involves a record search to identify groups of workers who can rotate or change jobs with no paper trail, usually defined as a classification within a department. These groups define a worker's undocumented mobility among risk groups. In the graphic we see three job classifications in the department. In this example the two workers in the Assembler classification do not rotate between jobs. In the press operator classification two of the three workers only operate transfer presses and one operates the high-speed press. The two transfer press operators can operate either press. The two die setters can perform several types of jobs and therefore have no "typical day". The bottom figures represent the minimum risk groups or job functions that would need to be represented.
I should mention that at this point the sampling strategy has brought us to where we could use either dosimetry or profiling to collect the data.