From October to December 2018, Volkmar Mrass, Research Associate at the Department of Information Systems at the University of Kassel, completed a research stay at the City University of Hong Konginthe Hong Kong Special Administrative Region, China. The visit was at the invitation of Professor Christian Wagner, PhD, Chair, Associate Provost and CIO of this university. The contact with this professor, who has been researching and teaching at CityU since the mid-1990s, was established in January 2018 at an international conference in the USA. Volkmar Mrass was invited by Professor Wagner and appointed by the Dean of the City University of Hong Kong as a Visiting Fellow for this period.

The City University of Hong Kong (CityU) has about 20,000 students and about 800 academic staff and is ranked 55th among all universities worldwide (8th in Asia) according to the current  QSWorld University Rankings 2019 . In the field of "Information Systems" (Business Informatics), the City University of Hong Kong with its Information Systems Department is among the world leaders in terms of research and publication output. 

Volkmar Mrass interacted with both Professor Wagner and his team during his research stay and also participated in the weekly research meetings there. Towards the end of his research stay, he gave a research talk at the City University of Hong Kong with the topic "Designing Crowdworking Platform Systems", in which he presented results of his research on the goal-oriented design of crowdworking platforms including their surrounding work systems and discussed them with Professor Wagner and all participants.