Matching Workers, Workloads for Maximum Efficiency

It is well recognized that one of the most expensive parts of any operation is its workforce. Therefore, ensuring the efficient use of people within an organization is of paramount importance in order to ensure greater employee efficiency and value. However, in many work environments, optimum efficiency and fairness in judging work performance is found wanting. For example, a person doing 30 picks may be just as efficient as a person doing 60 picks because the actual time and effort allocated to do the 30 picks is more complex and time-consuming. So, how can a more accurate assessment of workload be determined?
Source: Manufacturing & Logistics IT, http://www.logisticsit.com