a class of activities and services that are not necessarily related to work. Typically, there is a hierarchy of rewards based on the perceived value of an activity or service. A reward may be awarded to a single person, or to an entire group. The most popular and widely accepted awards are for the most active and productive members of the group. The award for the most successful individual will be accompanied by a certificate of participation to be displayed proudly in their home, office or school. A number of other awards are awarded to the most productive individuals, in a range of categories including service.