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|  Measurement Challenges | 
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    Acquiring data without sacrificing end-user privacy
    
      - 
	Plan on providing a better log file format
      
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	Coordinate with W3C P3P Activity
    
 
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    Repeatability of findings and reliability of collected data
    
      - 
	What are good statistical samples?
    
 
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    Dealing with huge datasets
    
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	Must be handled in a distributed manner