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Industrial and organizational psychologists have researched this issue, with hundreds of studies spanning most different kinds of jobs in most developed countries now published. A work-sample test is especially strong for spotting people who need to do something right away after they are hired. For any worker who may need to learn new things on the job--and that is a lot of different kinds of workers, in a lot of different industries, and almost all managers--a "general mental ability" test adds to the predictive validity of selection applicants who will do well on the job over time as industry conditions and market pressures and technologies change.