The lecture given by Sibylle Schlaich and Heike Nehl at the Vision Plus Conference of the IIID (International Institute for Information Design) in Vienna is about designing pictograms within an international and historical context. Pictograms are an important part of communication at an airport in that they help to overcome language barriers. They influence the visual identity, because they communicate in a language which fits to each particular airport and country. It is interesting how their motifs, aside from the design and characteristics, always change to match the needs and circumstances. Standards, DIN standards and test procedures help to check and to standardise comprehensibility and recognizability.