Defining a storage-assignment strategy for precedence-constrained order picking

Maria A. M. Trindade, Paulo S. A. Sousa, Maria R. A. Moreira

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


A zero-one quadratic assignment model has been proposed for dealing with the storage location assignment problem when there are weight constraints. Our analysis shows that operations can be improved using our model. When comparing the strategy currently used in a real-life company with the designed model, we found that the new placement of products allowed a reduction of up to 22% on the picking distance. This saving is higher than that achieved with the creation of density zones, a procedure commonly used to deal with weight constraints, according to the literature.
Original languageEnglish
Pages (from-to)147-160
Number of pages14
JournalOperations Research and Decisions
Issue number2
Publication statusPublished - 2021


  • Correlated policy
  • Precedence constraints
  • Storage location assignment problem (SLAP)


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