On Thursday, September 08, 2022 the disputation of Matthias Billert took place at the department Business Informatics University of Kassel | Information Systems University of Kassel . Besides Prof. Jan Marco Leimeister and the examination board, colleagues as well as family and friends were present. Mr. Billert successfully defended his dissertation "Leveraging Digital Co-Creation Platforms for the Systematic Creation of High-Quality Contributions in the Public and Private Sector".
On the one hand, he presents different levels of participation as well as components of a service system as a co-creation system. On the other hand, he designs and evaluates a digital collaborative citizen participation platform for co-creation of citizen-initiated services in the public sector, a learning and qualification platform in the private sector and develops suitable service measurement models for quality determination. 

Professor Jan Marco Leimeister and the examination board around Professor Matthias Söllner, Junior Professor Sofia Schöbel and Professor Klusmeyer congratulated Matthias Billert warmly following his successful disputation. According to the tradition at the department, Professor Leimeister presented him with a doctoral hat individually designed by the scientific staff of the department. After the successful defense, a small reception took place. In the course of this, important milestones with regard to the doctoral period were acknowledged.