Subject: Object Oriented Modeling and Design

Difficulty: Medium

Marks: 8 Marks

An actor specifies a role played by a user or any other system that interacts with the subject.

Types of actors used in use case diagram:

1)Primary/principle Actor: People who use the main system functions are refereed as primary or principle actors.Example: in ATM system primary actor is customer

2)Secondary Actor: People who perform administrative or maintenance task are referred as secondary actors. It provides a service to the system under design. Example: in ATM system a person in charge of loading money into the system is a secondary actor.

3)External actor: The hardware devices which are required as apart of application domain and must be used are referred as external actors. Example: in ATM system printer is an external actor.

4)Other system actor: The other system with which the system must interact referred as other system actors.Example: in ATM system bank network system is another system actor.

Use case diagram for printing result from MSBTE website.