The minor consist of a free of choice minor. In this minor you can choose from different other fields to extend your knowledge. This minor doesn't have to be related in your field. There are hundreds of different minors you could choose from, including economics, tourism, and biology. As an example an ACS student could choose to do an economics minor, and vice versa.
The rest of the third and fourth year you must enroll in the Smart Solutions Semester, which is a project that joins students from multiple disciplines to do a project together. You also need to work on your final thesis, which is a personal research project to show your competence.