8
understood.
ud Use Case Model
Order Subsystem
Inventory Subsystem
Enter Sales
Order Detail
«extend»
Create
Sales
Order
View Product
Stock
initiates
initiates
«extend»
Sales Order
initiates
initiates
initiates
initiates
Add new
customer
View Current
Sales
Order
«include»
View
Sales
Order
Sales
initiates
initiates
Login
Logout
Change
password
Figure 2. 1 Example of Use Case Diagram
2.1.3 Data modeling
Data modeling is a process to organize and document a system’s data.
2.1.3.1 Explanation of Data modeling
“Data
modeling
is
a
technique
for
organizing
and
documenting
data
of
the
system.
Data modeling is sometimes called database modeling because a data model is eventually
implemented as a database. It is sometimes called information modeling.” [4]
The actual model is frequently called an
entity relationship diagram (ERD) because it
represents data in terms of the entities and relationships described by the data.
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