1. DFD, LDS, ELH Inter-Relationships
DFDs, LDSs, and ELHs are closely inter-related in the required system
can be cross-checked against each other
Logical
Data
Data
Flow
Structure
Diagrams
Entity
Life
Histories

2. LDS, DFD Inter-Relationship Diagram
Logical Data Structure
Data Flow Diagram b
Manager 1
Customer name
Register New Customer
Account No.
Customer
name
Account
Customer
No. A D1
Customer Details B
Bank Account D2
Bank Accounts
Customer/ Account Link
Balance
Amount c C 2
Employer
Record Deposits and Withdrawals D d
Transaction
Clerk E
A,B,C Data Stores contain Entities D Entities contain Attributes E Attributes are in Entities and Data Flows
ENTITY DESCRIPTION
Bank Account
Account No.
Balance
Date opened

3. LDS, ELH Inter-Relationship Diagram
Entity Life History
Logical Data Structure
Bank Account
Customer A
Account
Account Life
Opened
Bank Account
Customer/ Account Link
Balance *
Change o o
Transaction
Credit
Debit
ENTITY DESCRIPTION C
Bank Account
Account code B
Balance
Date opened

4. ELH, DFD Inter-Relationship Diagram
Entity Life History
Data Flow Diagram b
Manager 1
Customer name
Register
Bank
Account
Account No.
New
Customer
Customer
name A
Account
No.
Customer
New
Account
Account D1
Details
Life D2
Bank Accounts *
Balance
Balance
Amount
Change c 2
Employer
Record
Deposits And O O
Withdrawals
Credit
Debit d B
Clerk