(2)DFD
A “DFD” uses the four elements of “data flow,” “process,” “file,” and
“external,” and applies modeling to various operations and systems to express the flow of operations as a flow of data.
Symbol
Name
Reference
DFD
Abbreviation for “Data Flow Diagram.”
Meaning
Data flow
Represents the flow of data and information.
Process (Function)
Represents the processing of data.
File (Data store)
Represents data storage.
External (Data source/
data sink)
Represents the source or destination of
data.
Example
Order placement
information
Customer
Delivery
information
Order
process
System strategy
Updated
information
Chapter 3
DFD of the product delivery process from order placement by customer to delivery
Inventory master file
Inventory
information
Order acceptance
information
Delivery
process
Customer
information
Customer master file
(3)UML
“UML” is a visual language for modeling that standardizes the conceptual
components used in the development and specification decision stage. By
using standardized notations, the desired program can be recognized regardless of differences in language and development methods.
UML expresses the model using diagrams consisting of boxes and lines.
The typical examples of UML are summarized below.
Reference
UML
Abbreviation for “Unified Modeling Language.”
Reference
Data-driven
“Data-driven” refers to a technique that
focuses on data relationships and flow
to understand the business process.
Modeling techniques such as “E-R diagrams,” DFD”, and “UML” are considered data-driven techniques.
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