use case actors

[1170220109]

Use Case modeling is used to diagrammatically depict a system and those people or processes that interact with it. This system can be a business system (a process) or an application system (computer or web based). To understand the scope of the system under consideration a system boundary is used. Anything depicted within the system boundary is part of the system under consideration, while anything outside of it is not. Use cases are then used to define a group of user-system interactions that together deliver value to the user of the system. These users are called actors.

Primary Actor: 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.

Secondary Actors: Actors that the system needs assistance from to achieve the primary actor’s goal.
Finally, the Oracle Unified Method (OUM) concurs with the UML definition of Actors, along with Cockburn’s refinement, but OUM also includes the following:
Secondary 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.
Example:
A bank loan officer wants to review a loan application from a customer, and part of the process involves a real-time credit rating check.
Use Case Name: Review Loan Application
Primary Actor: Loan Officer
Secondary Actors: Credit Rating System

[171034206]

Actor is a living or non living thing. Actor stays away from the system boundary. Primary actor initiates the system to work and system depends on secondary actor for information.

[1171429410]

In use case diagram the actors are included to perform the actions in the system developed. The actors can be primary actor or secondary actor.
Primary Actor
Primary actor is the one who initiates the set of actions in the system. For example in railway reservation system the passenger is the primary actor as he initiates the search for seat availability in the train.
Secondary Actor
Secondary actor is the one who supports the primary actor to fulfill the need. Secondary actor do not initiate the set of actions until the primary actor starts. For example the bill desk is the secondary actor for the system to make payment for the primary actor.

[1173025809]

An Actor models a type of role played by human users, external hardware, or other subjects. In UML activities, it specifies a role played by a user or any other system that interacts with the subject.

There are two types of Actors in UML activity diagrams -
1. Primary Actors - Primary Actors are 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.
2. Secondary Actors - They are the actors that the system needs assistance from to achieve the primary actor’s goal.

[1171921109]

An Association between an actor and use case indicates that the actor and the use case somehow interact or communicate with each other. Use Case Actors generally termed as noun form which may be either a person or the System Action. There are generally two types of use case actors they are
1) Primary actor: Primary actors are those who interact with the system. Eg customer, Admin, System Clock are generally termed as primary actor

2) Secondary actor: Secondary actor are those supporting actors are actors providing services to the system eg Clerk

[1172540411]

ACTOR

Actor really means "someone /thing playing an active part in the operation of a system."
An actor might be a person, a company or organization, a computer program or a computer system, hardware or software or both.

Ex: invoice creator or order taker or manager. 



1)The system under discussion, itself.

2) Internal actor:  The subsystems of the System under Discussion.  An individual object in the software is also an internal actor.

3)The primary actor of a use case: The one and only primary actor of a use case is the external actor whose goal the use case is trying to satisfy, the actor whose action initiates the use case activity.

4)The secondary actor of a use case:  A secondary actor of a use case is an external actor which provides a service to the System under Discussion.  secondary actors helps to identify the external interfaces the system will use.  An external actor might be a secondary actor on one use case and a primary actor on another use case.

A secondary actor might be a high-speed printer, it might be a web service, or it might be a group of humans.

[1171948312]

Actors- It can be living or non- living thing. It is represented by a noun.

There are two types of actors- Primary and Secondary.

Primary Actor- End user or for whom the system is designed- Ex:- For an ATM machine the customer will be the Primary actor
Secondary Actor - Who maintain the system or on whom/which the system is dependent on. Ex:- For an ATM machine, cashier of the machine will be the secondary actor because he will fill the amount whenever it is needed or when the ATM do not have amount in it.

[1170944412]

Actors are one of the 4 major elements while drawing a use case diagram. These are entities that interact with the system being built, it can be a living or a non-living thing.
Primary actor- this is typically the stakeholder that turns to the system to deliver one of its services, i.e. primary actor (s) would initiate the system to work.
Secondary actor- Actors the system will need support from to achieve the primary actor’s goals. In other words, an external actor that would provide service to the system being built so that the system may deliver service to the primary actor.
Example: Consider Railway reservation system, in here the passenger interacts with the system to search and book train tickets so he could travel to the desired destination. He is invoking the system to work and availing its service, so the passenger in this case would be the primary actor

[Nitin John]

Use case actors.Actors who perform system action or interact with system capabilities are called actors, actors can be human, machine, other any system.Actors are classified in two types Primary actor and secondary actor.
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

Eg :  For a online shopping system, customer is making payment through online
 
          Here Customer is primary Actor and payment gateway will be the Secondary actor

[1180650901]

Primary use case actors are those actor which interact the system first ,
through them secondary actors functions.

[Satish kumar Gajula]

Actors include in Use Case:
1.   Primary Actor
2.   Secondary Actor

Difference between Primary and Secondary Actor:
Primary Actors are 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 are actors that the system needs assistance from to achieve the primary actor's goal

[1172540611]

An actor is someone who interacts with the system by sending or receiving the messages to and from the system.
There are 2 types of use case actors:
1.Primary actor
2.Secondary Actor

1.Primary Actor:
   Primary actor initiates the interaction with the system.
2. Secondary Actors:
   Secondary actors do not initiate interaction with the system but participate in one or more use cases of the system.

[1182057301]

Actors in use cases are the external roles interacting with the system.
Primary actors are the ones who use the system towards a particular goal. They are usually the actor who initiates the use case, although this is not always true.
Secondary actors provide assistance to the system in achieving its goals.Secondary actors are often external systems providing a service, but they can also be humans who are playing a similar role.

[1180364703]

There are basically 2 types of actors and 2 types of use cases.
The actors are:
1. Primary actors
2. Secondary actors

The use cases are :
1. Essential use case
2. Supporting use case

Primary actors are the ones who directly performs actions with the system.
Secondary actors are the ones who does not directly interact with the system.

Essential use cases are the actual actions performed by the actors.
Supporting use cases are the ones which support the actors in achieving the essential use case.

[1180654601]

An actor in the Unified Modeling Language (UML) specifies the role played by a user or any other system that interacts with the subject.
Actors may represent roles played by human users, external hardware, or other subjects.

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.
A primary actor initiates an interaction with the system.

Secondary Actors: Actors that the system needs assistance from to achieve the primary actor’s goal.
Secondary 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.
The system initiates interactions with secondary actors.