Course class event relationships

Relationships	Type	Cardinality	Description
created-by	people	To-One	Person that created the resource
modified-by	people	To-One	Last person to modify the resource
student-materials	course-materials	Has-Many
teacher-materials	course-materials	Has-Many
teachers	people	Has-Many
enrollments	course-enrollments	Has-Many
lessons	course-lessons	Has-Many
requirements	courses	Has-Many
classes	course-classes	Has-Many
completed-by	people	Has-Many	Students that completed the course