The research project “Transversal Competences Assessment in Secondary Schools: An International Comparison of Teachers’ Attitudes and Teaching Practices” (TraCiSS) results from a collaboration between researchers at the University of Bern (ICER) and the St.Gallen University of Teacher Education (Institute of Educational Psychology) to explore shared research questions on assessing transversal competences in secondary schools. By combining resources and sharing knowledge and experience, we aim to improve the efficiency of our research and broaden its geographical reach through an international survey. The primary objective of the TraCiSS study is to compare teachers' teaching practices regarding the assessment of transversal skills across different countries. We focus on the following questions: 1. Future-oriented importance: How do teachers in the countries studied assess the importance of specific transversal competences for the future lives of their students in society? 2. Current teaching practice: Which transversal competences are currently promoted and assessed in the classroom by teachers in the countries studied? What methods are used? 3. Needs analysis: What needs do teachers in the countries studied have regarding the promotion and assessment of transversal competences? 4. International comparison: What country-specific differences and similarities can be recognized concerning future requirements, current teaching practices, and the needs of teachers? To answer these questions, the research team conducted a comprehensive online survey of school teachers in Switzerland and Ukraine, as well as the network of international partner schools of the Goethe-Institut’s exchange program 'SCHULWÄRTS!'. The study focuses on school-based assessment of transversal competences identified in all fields of activity and subject areas. In the countries where teachers are surveyed as part of the TraCiSS study, different terms are used for these competences in official educational documents, including "überfachliche Kompetenzen", “cross-cutting skills” and "transversal competences". As partners in the TraCiSS project, we have therefore agreed to use the internationally recognized term "transversal competences" in our study following the ESCO-Definition (European Skills, Competences, Qualifications, and Occupations): learned and proven abilities that are commonly seen as necessary or valuable for effective action in virtually any kind of work, learning, or life activity (are not exclusively related to any particular context). The term “transversal competences” is used in all the joint project documents and publications. The term used in the teacher survey questionnaire was appropriate for the sample (country), providing a short common explanation to ensure respondents understand it similarly.