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Part 2-9 of the IEC 60721-2-9 series is created for the strategy for defining an environmental description from measured data acquired at multiple locations whilst a product is either in storage, being transported or in-use at weather or non-weather protected locations. This measured data is normally in the form of acceleration versus time records. This, in turn, will then allow appropriate severities to be chosen from the IEC 60068-2 series of shock and vibration test methods. Environmental levels given in IEC 60721-3 should then be applied, having been updated based upon the strategy described in this document IEC 60721-2-9. The responsible committee is DKE/K 131 "Umgebungsbedingungen, Klassifizierung und Prüfungen" ("Environmental conditions, classification and tests") of the DKE (German Commission for Electrical, Electronic and Information Technologies) at DIN and VDE.