This technical supplement has been written to amplify the recommendations given in WHO Technical Report Series No. 961, 2011, Annex 9: Model guidance for the storage and transport of time- and temperature-sensitive pharmaceutical products.4 It outlines the actions that need to be taken to qualify refrigerated vehicles equipped with active temperature-control systems which are used to transport TTSPPs. Related topics are covered in the following Technical Supplements: ■ Checking the accuracy of temperature control and monitoring devices ■ Refrigeration equipment maintenance ■ Transport route profiling qualification