use case actors

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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.

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primary actors are who are acting on the system

secondary actors are the who are acted by the system

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use case actors are who are the persons performing in the project.

primary use case actors are the who are acting on the system

secondary actors are the who are acting supporting by the system

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Primary Actors:
Actors who interact with the system to achieve the goal of the primary actors.
Secondary Actors:
These actors assist the goal of the Primary actors to achieve.
Example:
ATM machine:
Primary Actor:
* Customers
Secondary Actors:
* Database
* Printer

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Actors: They represent the end users who are performing an action on the system. Basically, they play a major role in using functionality of the system.
These are again classified into 2 types:
Primary Actors ? They are the ones who is using the system on behalf of the user or may be just who directly interacts with the system. 
Secondary Actors ? They are the ones who support the system flow to execute the functionalities.

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Primary Actor - Primary actors are mainly the stake holders through the process happens.

Secondary Actor - Secondary actors are the supporting factors which help the system to fulfill the action .

Eg :   Receptionist is receiving payment through Card uses swipe machine
 
          Here Receptionist is primary Actor and Swipe Machine will be the Secondary actor .

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The users that interact with a system.An actor can be a person, an organisation or an outside system that interacts with your application or system

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The users that interacts with the system. 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.
There are 2 types of actor:
1.Primary actor
2.Secondary actor
Primary actor are the one who acts upon the system , they carry out the functionality.
Secondary actor are the one who supports the system to carry out its functionality.

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Primary Actors: The Actor(s) using the system to achieve a goal.
 The Use Case documents the interactions between the system and the actors to achieve the goal of the primary actor.
 Secondary Actors: Actors that the system needs assistance from to achieve the primary actor's goal.

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A primary actor :-
                               acts on the system
                               initiates an interaction with the system
                               uses the system to fulfill his/her goal

A secondary actor :-
                             is acted on/invoked/used by the system
                             helps the system to fulfills its goal

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Primary Actors: The Actor(s) using the system to achieve a goal.
 The Use Case documents the interactions between the system and the actors to achieve the goal of the primary actor.
 Secondary Actors: Actors that the system needs assistance from to achieve the primary actor's goal.

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An Actor is the one who initiates an action with the system. Actors could be anybody from persons who are the users of the system to organization and system too. They are basically initiators of the system.
Primary Actor who initiates the process or action, rest all are secondary actors.

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The users that interact with a system. An actor can be a person, an organization, or an outside system that interacts with your application or system. They must be external objects that produce or consume data.

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 Use case actors

1.   Actors is a living or non-living thing.
2.   Actor is represented by a noun.
3.   Actor always stay away from the system boundary
4.   Primary actor imitates the system to work 
5.   System depends on secondary actor for information.
6.   All reusable actors should be placed towards the right side of the system boundary.

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ypes 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.