Conclusion

5.1 Impact for practitioners

For those designing novel interfaces they need to be made aware that if their design is not intuitive, they risk confusing or frustrating their users.  How visually appealing the interface is may not be a factor at all in user preference of a site.  Also, site designers need to remember that in general broader/shallower trees are better and helps to accommodate experienced users.
 

5.2 Suggestions for future researchers

Currently many web-sites use something called cascading menus as an alternative to accessing links on different levels of the site structure.  It would be interesting to see what are the benefits and disadvantages to using such a menu system.  It would also be interesting to compare and come up with different novel menu systems.
 

5.3 Refine the theory or develop a new one

Performance times for version 1 and version 2 are about the same since they use the same link tree structure.  Users prefer version 2 over version 3 because the category semantics are often confusing.    

Other suggestions 
At least 70% of the subjects failed to find at least one of the links in the task list.  There were quite a few comments about how the categories were badly organized.  We suggest taking another look at how things are categorized, and develop a mechanism, through surveys and usage stats, for categorizing links.