Preece et al. define testing or evaluation as the process of ‘systematically   
   collecting data that informs us about what it is like for a particular user or   
   group of users to use a product for a particular task in a certain type of   
   environment’. (Preece    
   et al. 2002:317) That is to say that it is a process where the interface is   
   tested against the practices and needs of the user. (Faulkner 1998:109)   
   Evaluation is important in design as it aims to ‘...   
      
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