What does Use Case mean and what does use case describeSolut

What does Use Case mean? and what does use case describe?

Solution

Answer :

1.In Software and System engineering ,A Use Case describes how a user uses a system to accomplish a particular Goal.A Use case is a list of actions or event steps,defining the interactions between actors and system to achieve particular goals.

2.Use Case is a series of related interactions between a user and a system that enables the user to achieve a goal.

3.There are 3 basic elements that make up a use case :

          1.Actors

          2.System

          3.Goals

4.The purpose of use case diagram is to capture the dynamic aspect of a system.Use case diagrams are used to gather the requirements of a system including internal and external influences.

5.Actors are the type of users that interact with the system.Use cases capture functional requirements that specify the intended behavior of system.

6.Use cases contain the following elements :

         1.Name 2.Actors 3.Preconditions 3.Basic Flow 4.Alternate Flows 5.Post Conditions 6.Exception Flows

7.Use case diagrams specify the events of a system and their flows.Use case diagram can be imagined as a black box where only the i/p,o/p and the function of the black box is known.

8.Steps in designing use cases are 1.Identifying the users of the System

                                                   2.Structure the use cases

                                                   3.Create use cases for every goal associated with a use case template          and maintain the same abstraction level throughout the use case.

                                                  4.Validate and reviewing the users.