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

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

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

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