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chaPter 7 • Using Data Flow Diagrams 199

Item Master Figure 7.19
D2
File A physical data flow child diagram
for World’s Trend Catalog
Item Bin and Division.
Section Location

3.1 3.2
Order Item Order Item
Order Record Read Information Create Record Order Item
Item Order D6 File
Record Item
Record
Order Item
Record

3.3
Sort Order
Customer Item by
D1
Master File Location
within
Warehouse
Customer
Record
Sorted
Order Item
Record
3.4

Get Customer Number D7 Sorted Order
Customer Item File
Record

Sorted
Order
Customer Name, Item
Address, and Record
Telephone

3.5 3.7 3.6

Format Customer Line Print Order Item Line Format
Customer Order Item
Lines Picking Lines
Slip

Order
Picking
Slip

Partitioning Websites

Partitioning is a very useful principle when designing a website. Website designers who use
forms to collect data may find it appropriate to divide a website into a series of web pages, which
will improve the way humans use the site, the speed of processing, and the ease of maintain-
ing the site. Each time data must be obtained from a data store or an external partner, a website
designer might consider creating a unique Web form and DFD process to validate and process
the data.