Information scent and web navigation: theory, models, and automated usability evaluation
Within a more Information Foraging Theory, we have developed a rational analysis of Web use, which has shaped a cognitive model of Web navigation called SNIF-ACT. An automated and practical method for initializing the model with requisite knowledge of information scent was developed based on Pointwise Mutual Information (PMI) computations from a local document corpus with a Web back-off. An automated Web usability tool called Bloodhound was developed that implements an algorithm that approximates the operation of the cognitive model. We report on succesful empirical tests of the SNIF-ACT cognitive mode, the PMI method, and Bloodhound.
Pirolli, P. L. ; Fu, W. ; Chi, E. H. ; Farahat, A. O. Information scent and web navigation: theory, models, and automated usability evaluation. Proceedings of Human Computer Interaction International 2005; 2005 July 22-27; Las Vegas; NV; USA. Mahwah NJ: Erlbaum; 2005.