Mathematical foundation of simulation tools
    
      - Simulink:
        
          - obvious mathematical description of many blocks
 
          - but not always (e. g. Rate
              Transition)
 
        
       
      - Stateflow:
        
          - operational and denotational semantics (Hamon,
            Rushby)
 
          - formal verification of complex Stateflow+Simulink
            models (Zhan et al)
 
        
       
      - SimEvents:
        
          - since version 5 based on a unifying theoretical
            description SEES
 
          - similar, but different to PDEVS
 
          - formal description of components not openly
            documented
 
        
       
      - Arena:
        
          - based on SIMAN language
 
          - part of SIMAN formulated in PDEVS