Double blind - a test procedure in which the identity of those receiving the intervention is concealed from both the administrators and the subjects until after the test is completed; designed to reduce or eliminate bias in the results All enrolled drivers on a policy need to participate. Driver enrollment https://an-lisis-de-puesto-de-tra53628.collectblogs.com/81285155/análisis-de-puesto-de-trabajo-ergonomía-no-hay-más-de-un-misterio