For some types of statistics, this value may be accompanied with a descriptive adjective, sometimes called a specialisation or aspect, that either describes how the character developed that particular score or an affinity for a particular use of that statistic (like Specialisations in Ars Magica or Attribute Aspects in Aria). Most games divide their statistics into several categories. The set of categories actually used in a game system, as well as the precise statistics within each category, vary greatly. The most often used types of statistic include: