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To learn UML, you must first learn 14 types of UML graphics. To learn graphs, you must first know what elements are on the graphs.
[Note] This document is not a basic tutorial Of the use case diagram, but a graphical Summary of the use case
A use case diagram is primarily a graph that represents the main event flow of a system. It is mainly used to describe the needs of customers, that is, users want the system to complete a certain function of the ability to understand the
The use case diagram is used to describe the relationship between users, requirements, and system functional units. It shows a system function model diagram that can be observed by external users.
[PURPOSE]: help the development t
Use case diagram: used to describe the relationship between users, requirements, and system function units. It shows a system function model diagram that can be observed by external users.
Main Purpose: To help developers understa
the extension use case adds new behavior to the base use case
Diagram Description:
Association:
Depend on:
Generalization:
Contains:
Extended:
Two. Role: Describe the needs of the user (emphasizing the function, the performer of the function, the
ArticleDirectory
(1) from the perspective of general users
(2) From the operator's perspective
(3) from the Administrator's perspective
Drawing a use case diagram is the first step from the software requirement to the final implementation. Its correctness directly affects the user's satisfaction with the final product. In fact, we can also s
Defined
system boundaries determine the boundaries between the inside and outside of the system.
the protagonist represents the role played by the external object. An object can play several roles, so it can be represented by several protagonists.
communication relationships are used to illustrate the participation of protagonists in use cases.
A
Case modeling is a part of UML modeling and the most basic part of UML. The main function of case modeling is to express the functional requirements or behaviors of the system. To put it bluntly, it is to explain what the system is, so you don't have to worry about how to work. I think the
As mentioned in the previous article on the relationship in the use case diagram, the use case diagram describes user requirements, describes system functions from the user's perspectiv
Recently has been learning the basic knowledge of UML, after watching the video, and did not have a good summary, in the process of drawing found a lot of problems, the following is the process of reading their own summary of the UML use case diagram of a little knowledge, share with you.
First, the concept
A use
The use case diagram mainly includes use cases, activists, and relationships.
Use Cases: A description of the sequence of actions that the system, subsystem, or class interacts with external participants, including various normal
, the general relationship can be expressed as follows:
The above is an article I have referenced. I think the difference between the three relations is very clear. Based on this, I will combine my own system to explain the project (Online Shopping System) as a whole.**************************************** *************************(1) overall system
reused multiple times. Helps reduce the level of functional repetition.Extension Use CasesA use case can be used to extend the behavior of another use case, usually in special cases. For example, suppose that before modifying a particular type of customer order, the user mu
The previous blog summarized the use case diagram, in which the relationship between use cases is only included, because the relationship between use cases is not particularly profound. This is also because the UML use
A use case diagram is a diagram that describes the functions of a system by actors, use cases, and relationships.
Participant: A person who directs a system, or a
Example
Defining system boundaries determines the boundaries between the system's interior and exterior.
The main character represents the role played by the external object. An object can assume several roles, so it can be represented by several leading roles.
Communication relationships are used to clarify the participation of the main character in the use ca
Use case diagram (Use Case daigrams)
The Use Case view of UML is the view of the external feature description of software products. It describes the demand for software products from t
I. DefinitionUse case diagram describes the system function model diagram observed by external users of the system. external users are called "Participants", and system functions are presented in the form of "
confirmation, preferably with the user representative to confirm the signature.(2) "Review requirements Document" Activities, can not be omitted, the need for system analysis, designers to fully understand, analyze the requirements, confirm that the requirements analysis described clearly, and do not go beyond the scope.(3) "Create and publish a requirement baseline" activity, which solidifies the requirements and requires the creation of a demand tr
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