According to the self-categorization theory ("reicher-2010"), people define themselves as a member of social categories (seeSelfCategory). When people share the same SelfCategory, they often act collectively if they feel as in-group member to this category. For instance, two protesters - which define themselves as in-group members of the category protesters - walk together during a demonstration. This enum shall capture this in- and out-group membership. The membership can be interpreted as a tree:
Membership /\ / \ / \ In Out / | \ / | \ / | \ Friendly Neutral HostileFollowing outcome may be observed when two people with a given membership come together:
---
---
---
---
---