The document provides an overview of data flow diagrams and entity relationship diagrams. It defines what a DFD is, its components and symbols. It also explains what an ERD is and how to create one, including defining entities, attributes, relationships and cardinality. Examples of a DFD and ERD are given to illustrate the concepts.

2. “A” Level of Software
7:30 AM to 9:00 AM

4. Data Flow Diagram
Introduction
What is DFD
DFD Symbols
Examples
Section 1
Entity-Relationship
Diagram
What is ERD?
Components
Creating ERD
Example
Section 2

6.  Shows the context into which the
business processes fits
 Shows the overall business process as just
one process
 Shows all the outside entities that receive
information from or contribute
information to the system

8. A DFD is a formal way of representing how a business
operates.
Data Flow Diagramming shows business processes
and the data that flows between them.
A Data flow diagram (DFD) is a graphical
representation of the "Flow" of data through an
Information system, modeling its process aspects.

9. A DFD shows what kinds of Information will be
Input to and Output from the system, where the
data will come from and go to, and where the
data will be stored.
It does not show information about the timing of
processes, or information about whether
processes will operates in sequence or in parallel
(which is shown on a Flowchart).
Data flow diagrams can be used in both Analysis
and Design phase of SDLC.

11. A Source or
Destination of
data
Process that
Transform
Data Flow
Data Store

12. USER ATM

13. Student
Applies to
University
Student database
Approval
Registration
Application
Student Information

15. What is Entity Relationship
Diagram ?
An entity-relationship diagram is a Data
Modeling technique that creates a
graphical representation of the entities,
and the relationships between entities
within an information system.

17. Cardinality
Relationship
Entity

18. Identity the
entities
The Steps involved in Creating an
ERD are:
Determine all
significant
interaction
Analyze the
nature of the
interaction
Draw the
ERD
STEPS

19. Artist Songperforms
1. Artist performs Song
2. Song as performed by Artist

20. Entity 1 Entity 2
Entity 3
Relationship
Relationship
Attribute Attribute
Attribute
Attribute Attribute Attribute
Attribute
Attribute Attribute

21. Created By: