diff --git a/ex6.py b/ex6.py
new file mode 100644
index 0000000..1da217f
--- /dev/null
+++ b/ex6.py
@@ -0,0 +1,83 @@
+class Person:
+    def __init__(self, name: str, age: int, email: str) -> None:
+        self._name: str = name
+        self._age: int = age
+        self._email: str = email
+
+    def get_details(self) -> str:
+        return f"Name: {self._name}, Age: {self._age}, Email: {self._email}"
+
+
+class Student(Person):
+    def __init__(self, name: str, age: int, email: str, student_id: int) -> None:
+        super().__init__(name, age, email)
+        self._student_id: int = student_id
+        self._courses: list = []
+        self._grades: dict[str, str] = {}
+
+    def enroll_in_course(self, course: 'Course') -> None:
+        self._courses.append(course)
+    
+    def assign_grade(self, course_name: str, grade: str) -> None:
+        self._grades[course_name] = grade
+
+    def get_grades(self) -> dict[str, str]: 
+        return self._grades
+
+
+class Teacher(Person):
+    def __init__(self, name: str, age: int, email: str, subject: str) -> None:
+       super().__init__(name, age, email)
+       self._subject: str = subject
+
+    def assign_grade(self, student: Student, course: 'Course', grade: str) -> None:
+        student.assign_grade(course._course_name, grade)
+
+class Course:
+    def __init__(self, course_name: str, course_code: str) -> None:
+        self._course_name: str = course_name
+        self._course_code: str = course_code
+        self._enrolled_students: list[Student] = []
+
+    def add_student(self, student: Student) -> None: 
+        self._enrolled_students.append(student)
+        student.enroll_in_course(self)
+    
+    def list_students(self) -> list[str]: 
+        return [x.get_details() for x in self._enrolled_students]
+
+def main() -> None:
+    thorvald = Student("Thorvald", 28, "thorvald@example.com", 456)
+    johannes = Student("Johannes", 19, "Johannes@example.com", 35198)
+    tora = Student("Tora", 21, "Tora@example.com", 984555)
+
+    ola = Teacher("Ola Normann", 56, "ola_normann@example.com", "FYS101")
+    kari = Teacher("Kari Normann", 104, "kari.normann@example.com", "MATH999")
+
+    FYS101 = Course("Mekanikk", "FYS101")
+    MATH999 = Course("Matte", "MATH999")
+
+    students = [thorvald, johannes, tora]
+
+    for student in students:
+        FYS101.add_student(student)
+        MATH999.add_student(student)
+
+    ola.assign_grade(thorvald, FYS101, "F")
+    ola.assign_grade(johannes, FYS101, "E")
+    ola.assign_grade(tora, FYS101, "A")
+
+    kari.assign_grade(thorvald, MATH999, "B")
+    kari.assign_grade(johannes, MATH999, "D")
+    kari.assign_grade(tora, MATH999, "A+")
+
+    print(f"{thorvald._name}'s grades: {thorvald.get_grades()}")
+    print(f"{thorvald._name}'s grades: {johannes.get_grades()}")
+    print(f"{tora._name}'s grades: {tora.get_grades()}")
+
+    print("Students in FYS101:")
+    for student in FYS101.list_students():
+        print(student)
+
+if __name__ == "__main__":
+    main()