Question

Use CRC to design information system for a school. Use following classes: Professor, Class, School, Department, and Student, Identify the main responsibilities and collaborators for each class. Then draw a UML class diagram showing the relationships (and multiplicities) between the classes.

Answer 1

School
Responsibilities: Teach children Provide education Provide Infrastructure	Collaborator: Department

Department
Responsibility: Assign subject teachers Assign class teachers Allocate the number of student per class Assign professors to classes	Collaborator: Class

Class
Responsibilities: Space for teaching and learning Blackboard Professor Furniture	Collaborator: Professor

Professor
Responsibilities: Teaching Testing Grading	Collaborator: Student

Student
Responsibilities: Learning Discussions Attend Exams	Collaborator: Class

Class Diagram:

1. In the above diagram, the multiplicities 1 indicate that it is only one, corresponding to a particular scenario. For example: when we are considering a school, then it is only one, whereas all others like departments, classes, students, and professors can be many.

2. So, 1..* indicates that the school consists of more than one of those class members.