Online user comments, such as journalistic content or product features are associated with low quality, Hate speech or even excessive demands for moderation. Forum 4.0 will develop new methods based on text analysis, machine learning (with Human in the Loop) and Empirical Software Engineering to better exploit the constructive and deliberative potential of user comments. The aim is to systematically analyze, aggregate and visualize the content and quality of comments at runtime in order to enable constructive participation. The project builds on our previous work with social scientists and aims for an informatics-centered, interdisciplinary research network that combines the focal points “Information Governance Technologies” and “Data Science” of ahoi.digital. We foresee immense transfer potential for the media location of Hamburg. This project involves five research groups (Prof. Maalej, Prof. Biemann, Prof. Zukunft, Prof. Stöcker, PD. Loosen) in a collaboration with Hamburg University and Hans-Bredow-Institut.