In the Trusted Source project, we are investigating the availability, reliability, and completeness of information in various (agricultural) chains in several pilots. In the Fresh Upstream pilot, we are looking in particular at information related to biocides. Earlier in this pilot, plant protection information was the focus. The result of that study is described in the Trusted Source pilot Fresh Upstream report. Domain exploration of plant protection information in agricultural and horticultural sectors [43]. This report can be seen as an extension of that report, but with emphasis on biocides. In the pilot, we established information roundabouts for the different cases, as in this report on biocides and in the aforementioned report on plant protection.The assignment was to carry out a domain exploration, with a particular focus on master data. The basic question was what information is available and in what systems or messages this information appears. In doing so, we examined the sales chain where appropriate.