,---------------------------.                                                                                                        
                             |Supplemental Specifications|                                                                                                        
                             |---------------------------|                                                                                                        
                             `---------------------------'                                                                                                        
                                                                                                                                                                  
                                                                                                                                                                  
     ,----------.  ,------------------.   ,------------------------------.   ,---------------------------.                                                        
     |Principles|  |System Constraints|   |System Functional Requirements|   |Non-Functional Requirements|                                                        
     |----------|  |------------------|   |------------------------------|   |---------------------------|                                                        
     `----------'  `------------------'   `------------------------------'   `---------------------------'                                                        
                                                                                                                                                                  
                                                                                                                           ,------------------.                   
                                                                                                                           |Maintainability   |                   
,----------------------.                       ,-------------------------------.                       ,---------------.   |------------------|                   
|Performance Efficiency|                       |Usability                      |   ,---------------.   |Security       |   |Modularity        |                   
|----------------------|  ,----------------.   |-------------------------------|   |Reliability    |   |---------------|   |Reusability       |   ,--------------.
|Time behavior         |  |Compatibility   |   |Appropriateness recognizability|   |---------------|   |Confidentiality|   |Analysability     |   |Portability   |
|- -Response time      |  |----------------|   |Learnability                   |   |Reliability    |   |Integrity      |   |Modifiability     |   |--------------|
|- -Recovery time      |  |Co-Existence    |   |Operability                    |   |Maturity       |   |Non-Repudiation|   |- -Stability      |   |Adaptability  |
|- -Start-up time      |  |Interoperability|   |User Error Protection          |   |Availability   |   |Accountability |   |Testability       |   |Installability|
|- -Shutdown time      |  `----------------'   |User Interface Aesthetics      |   |Fault Tolerance|   |Authenticity   |   |- -Configurability|   |Replaceability|
|Resource Utilization  |                       |Accessibility                  |   |Recoverability |   |- -Privacy     |   |- -Installability |   `--------------'
|Capacity (Throughput) |                       `-------------------------------'   `---------------'   `---------------'   |- -Scalability    |                   
`----------------------'                                                                                                   |- -Localizability |                   
                                                                                                                           `------------------'