Differences between worker pairs in manual assembly: a case study

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Working in pairs is common and often necessary to carry out industrial manual assembly tasks. This paper studies differences in performance that can occur between pairs of workers. Within a case assembly product, activity analysis for each worker in a total of ten pairs and up to four repetitions (learning) is conducted on the basis of video evidence. The results show significant variation in assembly time between the pairs. Repetitions reduce the relative variation, while the ranking of the pairs remains mostly unchanged. In general, the time used for installing parts explain most of the variation between the pairs.
Original languageEnglish
Title of host publicationProceedings of the 8th Swedish Production Symposium (SPS 20189
EditorsMauro Onori, Lihui Wang, Xi Vincent Wang, Wei Ji
Number of pages8
Publication statusPublished - 25 Jul 2018
MoE publication typeA4 Article in a conference publication
EventSwedish Production Symposium - Stockholm, Sweden
Duration: 16 May 201818 May 2018
Conference number: 8

Publication series

NameProcedia Manufacturing
ISSN (Electronic)2351-9789


ConferenceSwedish Production Symposium
Abbreviated titleSPS


  • manual assembly
  • worker pairs
  • learning
  • variation

Cite this

Peltokorpi, J., & Niemi, E. (2018). Differences between worker pairs in manual assembly: a case study. In M. Onori, L. Wang, X. V. Wang, & W. Ji (Eds.), Proceedings of the 8th Swedish Production Symposium (SPS 20189 (Vol. 25). (Procedia Manufacturing; Vol. 25). Elsevier. https://doi.org/10.1016/j.promfg.2018.06.120