The 14th of November was World Usability Day. A local (to Bath) Company called Web Usability Studios (WUP) was hosting an event as part of the festivities. I went along to represent Ingenta and check things out.
WUP's main area of expertise is organizational, labelling and navigation aspects of Information Architecture (IA) and the event focused on these areas.
The first activity was a card sorting exercise. This introduced the concepts of chunking and labeling information.
The next part of the presentation consisted of several videos of web site testing sessions performed by WUP. In each clip the tester was given a specfic task to perfom on the site being tested, for example finding a particular spare part for a product. The video showed the tester screen to see the interactions with the site plus a "headshot" video of the tester and their voice plus the voice of the person running the tests. Each of the videos demonstrated the need for good IA in different ways. Serveral of the testers failed their tasks completely despite being choosen as potential users of the sites under test.
The problems identified by the videos included:
- Too many navigational elements on the screen at once
- Bad overall structure of the site
- Poor wording for links (either non-descriptive wording or not enough words used)
- Use of jargon
- Trigger words for links
The concept of chunking was then added to these problems as with reference to some "after" tests on the new versions of the sites previously tested. The difference was marked. All the users achieved their goals often within seconds as opposed to minutes. A signigicant aspect of chunking, Millers "7 items plus or minus 2" rule was introduced. This is a psychological aspect of interaction where normally people can consider a finite amount of information about a given topic at any time, normally about 7 items. This obviously applies to navigation elements in a page as too many elements mean the user cannot process the navigation effectively.
The discussion broadened into other aspects of information architecture and design of sites such as:
- "conventions" for layout (e.g. logo / home-button at the top left)
- use of colour
- the flow of the site (in graphic design terms)
- consistency and brand image
- the use of "bells and whistles" such as pop-ups, flash etc.
This led to a discussion of "post search chunking". This is the splitting up of a user's search results into categories in some way instead of presenting a plain list of links. For an example try a search for a generic word on Amazon. The results are presented with results grouped into several categories such as books, DVDs etc. This can be a valuble tool in persuading users of a site to explore instead of hunt for a specfic piece of information.
Finally we were presented with a statistical analysis of our card sorting exercise, This showed how it is possible to work out statistically which schemes of grouping into chunks can be determined. Some of the results were surprising but this highlighted the need to test such things objectively.
Overall, the afternoon was very interesting and highlighted several of the important issues which our Information Architects have to consider.