"We are writing in regards to Armstrong et al`s recent discussion paper (1), which addresses the scientific basis of ISO standards on biomechanical risk factors and more specifically the OCRA methodology. The paper comments on the ISO's working methods, but it will be up to the ISO to respond if it sees fit to do so. As the authors of the OCRA method, we wish to respond in a individual capacity. For several years, we have belonged to an ISO working group (ISO TC 159/SC3/WG4) advocating methods for the assessment of biomechanical overload risk; the members of the working group come from various countries and represent public authorities, social partners and researchers with particular expertise in this field.

Our decision to send this letter to the editor was motivated by the following position put forth in Armstrong et al`s paper concerning the rigor of development of the ISO ergonomics standards: ..."

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