The effect of worker learning and forgetting on storage reassignment decisions in order picking systems

Authors:
Eric H. Grosse;Christoph H. Glock;Mohamad Y. Jaber
Affiliations:
Institute of Industrial Management, Technische Universität Darmstadt, Hochschulstr. 1, 64289 Darmstadt, Germany;Institute of Industrial Management, Technische Universität Darmstadt, Hochschulstr. 1, 64289 Darmstadt, Germany;Department of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto, ON M5B 2K3, Canada
Venue:
Computers and Industrial Engineering
Year:
2013

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Abstract

Order picking is a time-intensive and costly logistics activity as it involves a high amount of manual work. Prior research has mostly neglected the influence of human factors on the efficiency of order picking systems. This paper develops a mathematical model that investigates the impact of learning and forgetting of a heterogeneous workforce on order picking time and, consequently, on storage assignment decisions. In particular, the paper investigates when to change a storage assignment and when to keep it if learning and forgetting occur among the members of an order picking workforce. The results show that learning and forgetting should be considered in order to achieve a proper planning of storage assignment strategies.