use case actors

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An Actor is the person who begins a system action. Actors might range from individuals who are system users to organisations and systems themselves. They are the system's primary initiators.
The primary actor is the one who starts the process or action; the others are subsidiary actors.

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Primary actors - are those who directly intereact with the system for e.g., Customer
Secondary actors - are those who support the system . for e.g., Database server

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A use-case describes a sequence of actions, performed by a system that provides value to an actor. The use-case describes the system?s behavior under various conditions as it responds to a request from one of the stakeholders, called the primary actor

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Primary Actor: Primary actors are the one who initiates or perform some action.

Secondary Actor: Secondary actors are the one who support system action.

Example :  customer is making payment through online. Here, Customer is primary Actor and Bank will be the Secondary actor .

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Actors:- The use case that interacts with a system. An actor can be a person, an organization or an outside system that interacts with your applications or system. They must be external objects that produce or consume data.

Primary actors:- The primary actors of a use case is the stakeholders that calls on the system to deliver one of it's services. It has goals with respect to the system -one that can be satisfied by it's operation. The primary actor is often, but nit always the actors who triggers the use case.

Secondary actor:-A secondary actor is one from which the system require assistance to complete the use case.  A secondary actor never initiates the use case. It is invoked by the system's use case in order to obtain information or a result.

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Actor in a use case diagram is any entity that performs a role in one given system. This could be a person, organization or an external system and usually drawn like skeleton

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 actor: 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. There may also be many secondary actors of a system.

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An actor in the Unified Modeling Language (UML) specifies a role played by a user or any other system that interacts with the subject.

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.

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There are mainly two types of actors can be depicted in a Use case:
1. Primary actors ? It starts the process
2. Secondary actors ? It assists the primary actor

Moreover, we can categorized actors into four types :
? Human
? System
? Hardware
? Timer

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Can Anyone explain me Who are Use Case Actors i.e., Primary Use case Actors Vs Secondary Use case Actors

Primary Actor is an actor who interacts with the system. For every use case diagram there is only one primary actor
Secondary actor is an actor who supports primary actor to interact with system. Use case diagram can have more than one secondary actors

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1. Primary Actor - A primary actor initiates the interaction with the system and kept on left side of system. All primary actors are placed on the left side of system
2. Secondary Actor - Secondary actor may provide a service to the system and also supports primary actor to interact with the system and all secondary actors are placed on right side of system

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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. 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. While a single physical instance may play the role of several different actors, an actor does not necessarily represent specific physical entities, i.e. a timer that triggers sending of an e-mail reminder.