A minor consists of a coherent programme of courses worth 15 or 30 EC. You take the minor in the first semester of your third Bachelor's year. You can choose a thematic minor or a free (self-composed) minor. It is not possible to do a minor during your Master's programme.
Choose here for more information on the range of thematic minors, registration, enrolment, unenrolment and other practical issues that apply to your situation: