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Quite often, an office or business operates with too few or too many people. Too few people causes existing staff to spread themselves too thin, resulting in superficial work and missed deadlines; too many people causes operating costs to increase and produces decreased gains in productivity. Ideally, you want an optimum level of people. Resource leveling is the way to achieve that optimum level.
Resource leveling is a method that reduces the peaks of having too many people and the valleys of having too few people in an organization or a project. In other words, it enables having a steady workforce available to meet needs.