Two issues in setting call center staffing levels. Chen, B. P. K. & Henderson, S. G. Annals of Operations Research, 108:175–192, 2001.
Two issues in setting call center staffing levels [pdf]Paper  abstract   bibtex   
Motivated by a problem facing the Police Communication Centre in Auckland, New Zealand, we consider the setting of staffing levels in a call centre with priority customers. The choice of staffing level over any particular time period (e.g., Monday from 8am - 9am) relies on accurate arrival rate information. The usual method for identifying the arrival rate based on historical data can, in some cases, lead to considerable errors in performance estimates for a given staffing level. We explain why, identify three potential causes of the difficulty, and describe a method for detecting and addressing such a problem.

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