A seven element grammar of context of speech acts:

1. Scene      
  Setting    
    Time  
    Place  
      Location
      Use of space
  Purpose    
  Topic    
  Genre    
2. Key      
3. Participants      
  Who they are    
  Roles they take    
4. Message form      
  Speaking    
  Writing    
  Silence    
  Other media    
    Video  
    Overhead projection, slides  
    Amplification  
    Recording  
5. Sequence      
  Set agenda    
  Open agenda    
6. Co-occurrence patterns      
7. Manifestation      
  Tacit    
  Explicit    

Source: Scollon and Wong Scolllon, 1995:22-23