Effective communication is one of the most important 21st century skills. It is often thought that this skill can only be learned through face-to-face education. However, recently developed technology makes it possible to do this also online, for example through the DialogueTrainer tool for conversation scenarios. From the beginning I have been involved in the development of this tool within two university-wide projects (these are the projects Communicate I and II; 2013-2019). First, I used this tool centrally and on a large scale in education, namely the course 'Professional Conversation' within the Psychology course (approx. 500 students per year).