The answer to this question is: Rotation challenges
Studies show that When an employee has been handling a certain job for a prolonged period of time, the employee will develop a certain way of thinking that make it easier for that employee to be effective in that certain job while reducing the employee's capability in doing another type of job.
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The rock is weak and molten and can actually flow like lava.
Franklin wanted the college curriculum to include subjects he considered valuable. “As to their STUDIES, it would be well if they could be taught every Thing that is useful, and every Thing that is ornamental
