The cost to fix a problem Requirements Time 25 Design Stage discovered Relative repair cost (pday) Requirements 0.1-02 Cod Desian 05 10 Unit Test Coding Unit test 25 Acceptance Test Acceptance test Maintenance MaintenanceThe cost to fix a problem Stage discovered Relative repair cost (p.day) Requirements 0.1 – 0.2 Design 0.5 Coding 1 Unit test 2 Acceptance test 5 Maintenance 20 100 2.5 5 10 25 .5 - 1 Requirements Time Design Coding Unit Test Acceptance Test Maintenance Stage