Within Europe most Occupational Safety and Health (OSH) monitors measure the same concepts differently. Consequently, European wide comparisons on OSH become difficult. Even when questions are (about) the same, cultural differences may hinder comparative analyses. Therefore, better insight and agreement is needed on what is measured. Furthermore, a discussion on how to combat these shortcomings will result in relevant European wide measurements. Additionally, for new and emerging OSH issues comparability in OSH monitors will be enhanced.