The official rules for the Core Area are specified in the examination regulations. Below is an inofficial translation.
In the Core Area you need to take courses for 44-64 credit points (CP) from Mathematics, Computer Science and Ethics. There are some mandatory courses, and some elective courses. The Core Area has its own catalogue of elective courses, which you can find in RWTHonline. The following description only refers to the Core Area. Do not confuse it with the Focus Areas Mathematics or Computer Science.
- In Ethics there is only the mandatory course Ethics, Technology, and Data (4 CP).
- In Mathematics you have to take the mandatory course Mathematics of Data Science (9 CP). You need at least 18 CP of core courses in mathematics. This means you have to take elective core courses in mathematics for at least 9 CP.
- In Computer Science you have to take the mandatory course Introduction to Data Science (6 CP). You need at least 18 CP of core courses in computer science. This means you have to take elective core courses in computer science for at least 12 CP.
Adding up the minimum requirements of 4 CP from ethics, 18 CP from mathematics, and 18 CP from computer science, you have 40 CP. Which means that you need to take at least 4 CP more of elective courses (from mathematics or computer science).