1. Entity Life History Simple Life Bank Account Cheque Cashed Direct Deposit Pay Deposit Account Deletion Account Closure Account Life Account Opened Transaction * o o o Time Sequence Iteration Selection

2. Entity Life History - Parallel Lives Consider the following EVENTS which affect an entity PART: 1. Someone makes a decision to stock a PART 2. A supplier delivers stock against an order for the PART 3. A customer places an order to buy the PART 4. Someone decides that the PART should be superseded 5. Someone decides to stop stocking the PART

3. Entity Life History for PART Stocking Part Shelf-life Safety Normal Delivery Sale Discontin -uance Super- session o o Q1 R1

4. Entity Event Matrix Employee Appli. History CarClaimJourneyGrade Entity Event Register authorised user Register change of job Register change of car Register claim Check journey details C MC C C C/M C/D C NOTE: If an entity is never created then something has been missed e.g. Grade in this example.

5. Complete ELH Employee Initial authorisation Mid-life Leave company Authorisation cycle Change carChange job Change employee details oo o * 1 2 3 4 5 9 6 6 7 8 -/1 1,2,4,5/2 1,2,4,5/3 3/41,2,4,5/5 1,2,4,5/6 Operations list 1. Store keys 2. Store remaining attributes 3. Gain car entity 4. Tie to grade entity 5. Store grade using grade calculation 6. Replace grade using grade calc. 7. Replace job detail attributes 8. Replace employee details 9. Cut from grade entity Car Allowance System Employee Pay-no Name Address Job-title Job-location Salary-grade Current-allowance-grade Date-authorised-driver Driver-test-results