ISO/TS 10303-1174:2005 specifies the application module for Class of activity library.
The following are within the scope of ISO/TS 10303-1174:2005:
the existence of a class of activity;
a mapping between one class of activity and another that indicates the nature of a whole-part relationship between two individual activities;
a mapping between one class of activity and another that indicates the nature of a connection relationship between two individual activities;
a mapping between a class of activity and a class that indicates the nature of an involvement in an activity;
set theory relationships, such as subset, union and intersection, between classes of activity and between mappings.