For instance, while runners dropping down may provide an interesting comparison, the ranking system should also emphasize competition within a reasonably competitive mix. Another important variable is which events are considered in the rankings. The list of BAOC areas has been fairly consistent over the last few years, stemming from he original Technical Committee list of 1996. They are those of A and B quality level in terms of terrain and map. Events at those areas where A or B meet rules and standards are intended are used as ranking events.
Variations depend on meet directors' objectives and the addition of newly mapped areas.
The primary criteria are fairness, challenge and standards. The intent is to use those events likely to produce fairest competitive results. Even among the best, it is clear that not all B meets are equal. It is difficult to quantify these variables in the ranking procedure because they are usually subjective and also, to some extent, because of some lack of interest within the sport to an analytical approach. Awareness of variation in event quality, however, is useful when comparing individual performances and weighing the reliability of the lists.