Maybe there are just two basic pathways: I choose to equip myself/my household to be relatively autonomous and self-supporting for a finite period of time, within the constraints of location and resources; or I choose to equip a larger group (neighborhood, scout troop, congregation)to do so. The latter is not simply the former writ large. Working with a group adds the human behavior in organizations element. The forum moderators seem todo this-Martin, Blast,-seem to be actively involved in this sort of thing-maybe interest in group survival is that which develops after one develops mastery of personal/family survival, and recognizes its limitations in long-term and widespread survival scenarios.