1. Test environment
   1. Software
      1. Python scripts
      2. Test harness, e.g. Test Manager
   2. Hardware
      1. Patch panels
      2. Switches
      3. Linux server & workstations
      4. Racks
      5. Fiber cables
      6. Testers
         1. Agilent N2X
         2. Ixia Automated Network Validation Library
         3. Spirent Avalanche
2. Conformance
   1. Open standards
      1. IEEE 802.x
      2. DSCP
   2. Closed standards
      1. Aker Solutions
3. Functional
   1. Features
      1. Diffserv
      2. LAG
      3. IME
      4. Interfaces
   2. Levels
      1. Unit
      2. Integration
      3. System
         1. Solutions
            1. Acceptance
   3. Requirements
      1. White box
      2. Gray box
      3. Black box
4. Compatibility
   1. Interfaces
      1. Optical
         1. Bandwith1
         2. Bandwith2
   2. Network devices
      1. Switches
      2. Routers
5. Performance
   1. Load
   2. Responsiveness
   3. Capacity
      1. Speed
   4. Limitations
6. Regression
   1. Smoke
   2. Functional
   3. System
   4. ...risk based
7. Operation & Maintenance
   1. Configuration
   2. Monitoring
      1. Performance
      2. Notifications
      3. Logs
      4. Alarms
   3. Upgrade or replacement
      1. Software
      2. Hardware
8. Availability
   1. Systems
      1. Total system
   2. Sub-systems
      1. Branches
   3. Sets
      1. Pair
   4. Backups
   5. Upgrade
9. Security
   1. Passive
      1. Monitoring
   2. Active
      1. Attack
10. Environmental
    1. Temperature
    2. Moisture
    3. Vibrations
    4. Pressure
    5. Drop