General methodical procedure for trend surveys based on annually repeated cross-sectional surveys. The questionnaire consists of three parts: a) Questions asked annually, (b) questions raised at irregular intervals, c) and new questions. Questions on changes in travel behaviour caused by terroristic attacks abroad were raised for the first time in 2017 for the first time. For this reason, a quantitative pretest was carried out and it was of interest whether the respondents were able to answer the questions. Following the pretest, the question formulations were optimized. Finally, to check the comprehensibility of all questions and interviewing before the field phase, test interviews were conducted in the different national languages. The questionnaires were designed in German and then translated into French and Italian. The Helvetic question formulations were deliberately chosen, as the interviews in German-speaking Switzerland were mostly conducted in Swiss-German (mouth type). The attitudes surveyed here may have been influenced by the following five events: • The ongoing tensions between Russia and the EU resulting from the crisis in Ukraine. • The refugee debate in Europe. • The discussion concerning the withdrawal of Great Britain from the EU (Brexit). • The terrorist attack of 19.12.2016 on the Christmas market in Berlin and the attack on a nightclub in Istanbul on New Year’s Eve. • The subsidiary WEF deployment of the Swiss Armed Forces for the benefit of the civil authorities of the Canton of Graubünden in Davos.