1. Management Movie Management System Customers Databases Vendors
Check out movie
Check in movie
Add new customer
Modify or delete a customer
Add a new movie
Modify or delete a movie
Bill for unreturned movie
Customers
Databases
Vendors

2. Documenting the New (or existing) Business Process:
The products of the analysis phase:
Data Flow Diagrams (DFDs) and
Entity Relationship Diagrams (ERDs)

4. Signed Bill of Lading Notification Department of receipt Receive
Goods
Vendor
Lading
Signed Bill of
Lading
R. of G.
Receipt of
Goods File

5. Budget/Acct Information Vendor Expenditure Open P.O. File Invoice
Department
Budget/Acct
Information
Vendor
Expenditure
Open P.O.
P.O.
File
Invoice
Receipt of
Check
Make
R. of G.
Goods File
Payment

6. Request Budget Availability Issue Purchase Department Budget/Acct
Order
Bud Commit
Information
Available
Notification
of receipt
Vendors
Expenditure
P.O.
Vendor
Bill of
Lading
Receive
Information
Vendor
Goods
P.O.
Signed BoL
Open P.O.
R. of G.
P.O.
File
Invoice
Receipt of
R. of G.
Check
Make
Goods File
Payment

9. Department
Vendor
DFD Components:
External Entities

12. Data Store
Represented by a rectangle open at one end.
Used when it is functionally necessary to store
output from one process before sending it on to
the next process.
The data stores are the entities from the ERD!

14. DFDs do not show the flow of physical items, only of information
DFDs do not show the flow of physical items, only of information. (Payment amounts etc. can be considered information.)

17. Request Budget Availability Issue Purchase Department Budget/Acct
Order
Bud Commit
Information
Available
Notification
of receipt
Vendors
Expenditure
P.O.
Vendor
Bill of
Lading
Receive
Information
Vendor
Goods
P.O.
Signed BoL
Open P.O.
R. of G.
P.O.
File
Invoice
Receipt of
R. of G.
Check
Make
Goods File
Payment

19. Uses of Data Flow Diagrams
As a Requirements Analysis Documentation Tool:
Help analysts work out requirements with business
management and users
Help analysts communicate understandings with business
management and users
Help business management and users communicate
As a basis for design:
database design
application software (process) design