Question

Php

2. Use case diagram and the purpose of using a use case diagram.==> analysis

3. use case diagram and data flow diagram==> model the logical concept

4. draw a use case diagram or describe/explain a use case diagram

5. data flow diagram: context diagram + a set of subdiagrams

Answer 1

Use case diagram was proposed by Jacoboson in the book A use case driven approach in 1992. Use case diagrams are described in texts as well as in diagrams also . use case diagrams describes the interaction between the user of system called as actors . Use case diagrams shows three aspects of the system 1.Actors 2.Use cases 3.system Boundary..

Use case diagrams are used to gather the requirements of a system including internal and external influences. These requirements are mostly design requirements. Hence, when a system is analyzed to gather its functionalities, use cases are prepared and actors are identified.

Use case diagrams are used to gather the requirements of a system.

Use case diagrams are used to get an outside view of a system.

Use case diagrams are Identify the external and internal factors influencing the system.

Use case diagrams show the interaction among the requirements are actors.

A data flow diagram shows the way information flows through a process or system. It includes data inputs and outputs, data stores, and the data moves through the various sub processes.