But any major industrial accident involves several failures (cf. «Swiss cheese model») and the use of different measurement system was apparently one of them in this case. (politics.stackexchange.com)
• What are the systematic differences between different measurement systems for sea ice thickness? (psc.apl.uw.edu)
Statisticians can advise on how best to combine data from different sources, how to identify and adjust for biases in different measurement systems, and how to deal with changes in the spatial and temporal coverage of measurements. (climateaudit.org)