Transcript Structured Systems Analysis and Design Methodology

Entity Function Matrix – Putting It
All Together
Northern College Diploma
Philip Bird
The SSADM Route
Data Flow Modelling
Current Physical DFD
Current Logical DFD
Entity Modelling
Problems and new
requirements
Required Logical DFD
Entity Model
Entity Life History
Required Physical DFD
Entity Function Matrix
Information Systems
Philip Bird
Entity Function Matrix
Cross reference entities with functions.
List all entities from entity modelling.
List all functions from data flow
modelling.
Mark the intersection with a Delete,
Read, Modify, Create or leave blank.
In a full system all entities should have
D, C, R/M entries.
Information Systems
Philip Bird
Order Processing DFD
Customer
2
Cancel order
4
Add new customer
Supplier
Customer
Order
1
3
Place order
Product
Information Systems
Get stock delivery
Philip Bird
Order Processing Entity Model
Customer
Order
Order line
Information Systems
Product
Philip Bird
Entity Function Matrix
Process
Customer
2
1 Place
order
Cancel order
4
Add new customer
2 Cancel
order
Supplier
Customer
Order
3 Get stock
delivery
1
3
Place order
Product
Get stock delivery
4 Add new
customer
Information Systems
Philip Bird
Entity Function Matrix
Entity
Process
1 Place
order
Customer
Order
Product
Customer
2 Cancel
order
Order
3 Get stock
delivery
4 Add new
customer
Information Systems
Order line
Product
Philip Bird
Entity Function Matrix
Entity
Process
Customer
Order
Product
1 Place
order
R
C
M
2 Cancel
order
R
D
M
3 Get stock
delivery
4 Add new
customer
Information Systems
M
C
Philip Bird