| Introduction to layered approach |
| Dual Control |
| Layer 9 - End Users - Checkered |
| Layer 8 - Governance - Purple |
| Layer 7 - Management - Blue |
| Layer 6 - Logic - Green |
| Layer 5 - Access/Security Gateway - Yellow |
| Layer 4 - Application Infrastructure - Orange |
| Layer 3 - Data Management - Red |
| Layer 2 - Operating and Network Systems - Brown |
| Layer 1 - Processors & Devices - Black |
| References |
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