Repetitive work of the upper extremity: Part I–Guidelines for the practitioner * *The recommendations provided in this guide are based on numerous published and unpublished scientific studies and are intended to enhance worker safety and productivity. These recommendations are neither intended to replace existing standards, if any, nor should be treated as standards. Furthermore, this document should not be construed to represent institutional policy.The following individuals participated in the discussion of the earlier version of this guide. Their suggestions (written or verbal) were incorporated by the authors in this version: Arne Aaras, Norway; Fred Aghazadeh, USA; Roland Andersson, Sweden; Jan Dul, The Netherlands; Jeffrey Fernandez, USA; Ingvar Holmér, Sweden; Matthias Jäger, Germany; Anders Kjellberg, Sweden; Olli Korhonen, Finland; Helmut Krueger, Switzerland; Shrawan Kumar, Canada; Ulf Landström, Sweden; Tom Leamon, USA; Anil Mital, USA; Ruth Nielsen, Denmark; Jerry Ramsey, USA; Murray Sinclair, UK; Rolf Westgaard, Norway; Ann Williamson, Australia; Jørgen Winkel, Sweden; Pia Zätterström, Sweden. The guide was also reviewed in depth by several anonymous reviewers.