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Can a use case without actor?
3 Answers. Officially this is correct. An included use case is a mandatory part of the including use case and an extending use case will optionally extend some use case. As @Ister notes in the comment, the actor for the included/extending use cases will be that of the main use case.
What is alternative use case?
A use case specification describes the functionality of a system in terms of a sequence of user-system interactions. An alternate flow describes a scenario other than the basic flow that results in a user completing his or her goal. It is often considered to be an optional flow.
What do use case exceptions represent?
What do use case “exceptions” represent? The purpose of exceptions in use-case is to identify some of the situations that are not covered in the preliminary use case. The situations that are identified in exceptions are covered while refining the preliminary use case.
Who are the supporting actors in a use case?
Supporting Actors: A supporting actor in a use case in an external actor that provides a service to the system under design. 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.
What are the different types of use cases?
Types of Use Cases and their Presentation Methods. There are basically two types of use cases analysts can draw from: Business Use Cases and System Use Cases. Business Use Cases are more about what a user expects from a system while System Use Cases are more about what the system does. Both use case types can be represented by diagrams or text.
What makes an actor in use case modeling?
These are called actors which has the following characteristics: An actor in use case modeling specifies a role played by a user or any other system that interacts with the subject. An Actor models a type of role played by an entity that interacts with the subject (e.g., by exchanging signals and data), but which is external to the subject.
How are alternative courses used in use cases?
In addition, there are alternative courses to the primary courses and these are typically used to achieve the use case goal using other means that are not used by the primary course. Alternative courses typically handle situations when a primary course fails or deviates due to some specific factor.