The Croatian market surveillance expert Ante Fuzul, who led the training, connected the theory of legislation and standards to the actual practice of implementing market surveillance by presenting the Croatian approach and discussed past challenges and how to deal with them when applying these market surveillance procedures. As WB6 coordinators of the SEE QI 4 project made available to all participants prior to the training photos of high-visibility vests (prsluci velike vidljivosti ), the group could practice together checking the compliance of the local products with the international standard. A special focus was laid on risk assessment and how to adapt general considerations to local circumstances to get valid results. Ante Fuzul explained how he benefited from exchanges of experience in AdCo groups and mentoring by other EU colleagues and was willing to share and upscale his documents, checklists and tips to the WB6 colleagues. Around 40 market inspectors followed the online training and on similarities and differences in their own practice. Working on the specific subject of high-visibility clothing contributes to the broader goal of harmonizing general market surveillance practices between the WB6 countries and the EU. A common checklist for the joint action on high visibility vests has been prepared and presented: the joint action is now ready to be launched.