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 We operate within an ecology of people, physical artifacts and electronic systems, 
  and this rich ecology has recently become more complex as electronic devices 
  invade the workplace and our day-to-day lives. We need methods to deal with 
  these rich interactions. 
  - Status-event analysis is a semi-formal, easy to apply technique that: 
    
      - classifies phenomena as event or status
 
      -  embodies naïve psychology
 
      -  highlights feedback problems in interfaces.
 
     
   
  -  Aspects of rich environments can be incorporated into methods such as task 
    analysis: 
    
      - other people
 
      -  information requirements
 
      -  triggers for tasks
 
      -  modeling artifacts
 
      -  placeholders in task sequences.
 
     
   
  -  New sensor-based systems do not require explicit interaction, this means: 
    
      - new cognitive and interaction models
 
      -  new design methods
 
      -  new system architectures.
 
     
   
 
            
            
            
            
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