Sage-Tips

Who are the primary users of use case diagram?

The primary actor of a use case is the stakeholder that calls on the system to deliver one of its services. It has a goal with respect to the system – one that can be satisfied by its operation. The primary actor is often, but not always, the actor who triggers the use case.

Who are primary and secondary actors in use case?

Actors are classified into primary actors (also called active actors) and secondary actors (also called passive actors). Primary actors initiate a use case and hence are somewhat independent. Secondary actors, on the other hand, are used by the system but they do not interact with the system on their own.

Can a use case have one actor?

Whatever, Actor in use case can be any person or object that will participate in some activity. So, a computer could be some sort of client who accepts phone’s commands and performs action based on it. BUT, in this case I would have User be only actor.

Can an actor be both primary and secondary?

A primary actor is capable to execute actions within the use case. The same user can have different roles. Those different roles can be primary and secondary actor for a certain use case.

How many types of actors are in use case?

Actors can be people, other systems, time triggers, or event triggers. An actor specifies a role played by a user or any other system that interacts with the subject. It may represent roles played by human users, external hardware, or other subjects.

What is secondary actor in use case diagram?

A secondary actor is one from which the system requires assistance to complete the use case. A secondary actor never initiates the use case. It is invoked by the system’s use cases in order to obtain information or a result.

How many primary actors are in a use case?

one primary actor
A use case within the system may have more than one primary actor, since more than one type of role may initiate the processes or functionality of the system.

How many actors can be related to a use case on a use case diagram?

If you want to draw them while learning you can use our tool to create use case diagrams. There can be 5 relationship types in a use case diagram. Let’s take a look at these relationships in detail.

What is the role of an actor in a use case?

An actor specifies a role played by a user or any other system that interacts with the subject. Actors are always outside the system and interact directly with it by initiating a use case, provide input to it, and/or receive outputs from it.

What are the three kinds of actors?

Types of actors used in use case diagram:

• 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.
• Secondary Actor: People who perform administrative or maintenance task are referred as secondary actors.

How do you identify the actors in the case of a new system?

Identify Candidate Actors for Use Cases Define each candidate actor by naming it and writing a brief description. Includes the actor’s area of responsibility and the goals that the actor will attempt to accomplish when using the system. Eliminate actor candidates who do not have any goals.

How do you identify an actor in a use case diagram?

Who is the primary actor in a use case?

The primary actor of a use case is the stakeholder that calls on the system to deliver one of its services. It has a goal with respect to the system – one that can be satisfied by its operation. The primary actor is often, but not always, the actor who triggers the use case.

Can multiple actors be associated with a single use case?

Multiple actors can be associated with a single use case. Check out the use case diagram guidelines for other things to consider when adding an actor. Generalization of an actor means that one actor can inherit the role of the other actor. The descendant inherits all the use cases of the ancestor.

What is the difference between a primary actor and Supporting Actor?

Supporting actors may or may not have goals that they expect to be satisfied by the use case, the primary actor always has a goal, and the use case exists to satisfy the primary actor. It might be an external server or a web service. A primary actor initiates an interaction with the system. The system initiates interactions with secondary actors.

How many actors should be used in a Bussiness?

In this case you should use just one Actor with name e.g. User. You will gain nothing adding all different positions in company as actors. But it does not mean that you must allways have only one Actor, see following diagram: It is more important to bind your Use cases to Bussiness process diagram.