The seminar on impact measures will first shed light on the best known and most controversial indicator, namely Garfield’s Journal Impact Factor. Its strengths and weaknesses as well as its correct use will be discussed thoroughly. Moreover, the corresponding analytical tool, Clarivate’s Journal Citation Reports, will be demonstrated. This presentation is a course at the european summer school for scientometrics (esss) offers intensive training covering major aspects of quantitative analysis of science and technology and provides a sound overview of state-of-the-art scientometric indicators and methods. Annually selected focus topics are addressed combining standard knowledge with current trends.