GESIS offers researchers support in the conception and implementation of interview training for standardized surveys. This service is based on many years of expertise in the field of interview training, in which GESIS cooperates with national and international partners. In addition, GESIS has developed a curriculum for interview training in the field of personal interviews in cooperation with large social science survey projects and survey institutes. This includes flexible modules with practical recommendations for conducting interview training for personal oral interviews (Daikeler, Silber, Bosnjak, Zabal, & Martin, 2017). The focus of the GESIS offer in the field of interview training is on general interview training. Like the project-specific interviewer training, this training aims to reduce interviewer effects with regard to various error sources in surveys, such as unit and item non-response, as well as measurement errors during the interview.