#participation__engagement__involvement  sharing the activities of a group; "the teacher tried to increase his students' engagement in class activities"
  exclusion:  non-engagement
  supertype:  group_action__groupaction  action taken by a group of people
  subtype:  commitment  an engagement by contract involving financial obligation; "his business commitments took him to London"
     subtype:  incurrence  the act of incurring (making yourself subject to something undesirable)
  subtype:  intervention__intercession  the act of intervening (as to mediate a dispute)
     subtype:  intermediation__mediation  the act of mediating
  subtype:  group_participation__groupparticipation  participation by all members of a group

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