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A data flow
diagram is a
graphical
representation of
data process
throughout the
organization.
4. ADVANTAGES OF THE
DATA FLOW APPROACH
Analysis of a proposed system to determine if
Communicating current system knowledge to
Freedom from committing to the technical
implementations of the system too early.
Further understanding of the interrelatedness
the necessary data and processes have
users of through systems data and subsystems.
flow diagrams.
been defined.
6. FOUR BASIC SYMBOLS USED TO CHART DATA
MOVEMENT ON DATA FLOW DIAGRAMS.
Student PADEnrraortotictawye Sstsore
7. Naming Processes
Compute Sales
Tax
Control System
Internet
Customer
Fulfillment
System
Add Inventory
Record
Inventory
Inventory
Reporting
Subsystem
Verify Customer
Account Status
9. BASIC RULES TO FOLLOW IN
CONSTRUCTING A DATA
FLOW DIAGRAM
Data flow diagram must have at least one
process, and must not have any freestanding
objects or objects connected to themselves.
The process must receive at least one data
flow coming into the process and create at
least one data flow leaving from the process.
External entities should not be connected to each
other. Although they communicate independently,
A data store must be connected to at least one
that communication is not a part of DFDs.
process.
11. EXAMINE THE NARRATIVE OF THE SYSTEM AND GROUP DATA INTO FOUR CATEGORIES: ENTITY,
PROCESS AND DATA STORE
CREATE A CONTEXT DIAGRAM – THIS IS THE
GENERAL DIAGRAM CONTAINING ONLY
ONE PROCESS.
LASTLY, BREAK DOWN THE
DIAGRAM 0 INTO A CHILD
DIAGRAM, A DETAILED
DIAGRAM, THROUGH THE
PARENT PROCESS
EXPLODE THE CONTEXT DIAGRAM INTO
DIAGRAM 0. THIS IS A MORE COMPLEX
DIAGRAM.
13. Forgetting to include a data flow or pointing an
Connecting data stores and external entities directly
arrow in the wrong direction.
Student 1
Including mIncoorerr tehcatnly nlainbee plinrogc persoscees sosne sa o dr adtaat afl oflwow diagram.
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to each other.
Student 1 Student 2
