From Device Description Working Group Wiki
The Top 5
During the DDWG's first charter a questionnaire was posted to invite opinions regarding the five most influential device properties, with respect to content adaptation. This was in order to provide input to the Landscape document, and to get a reliable collective opinion on how broad or narrow a core vocabulary would need to be in order to be generally useful for basic content adaptation.
The result indicated that there were 11 properties of significant importance in real-world scenarios.
Subsequently, the group met in Boston to discuss many things, including the results of the questionnaire. By this time, the result was being called the "Top 11" or the "Top N" to reflect the greater size of the set. As an exercise, the group discussed and further expanded the set to see how a vocabulary would grow. While this was taking place, a mind map was being drawn to record some of the points being discussed.
The information generated from this meeting was shared with colleagues in the OMA. The OMA subsequently made a formal public response, and were later represented at the DDWG workshop in Madrid, thus confirming the good working relationship between the two organizations.
The DDWG decided in February 2007 to publish the mind map as a historical record, which may have some value to the work on creating a formal core vocabulary. The mind map still has "Top 5" at the center, as this is where the process began.