Understanding the structure of gangs is a critical skill to defining the types of strategies that are most effective with dealing with them, from the at-risk youth to the gang leaders. Not all individuals who display the outward signs of gang membership are actually involved in criminal activities. An individual's age, physical structure, ability to fight, willingness to commit violence, and arrest record are often principal factors in determining where an individual stands in the gang hierarchy; now money derived from criminal activity and ability to provide for the gang also impacts the individual's status within the gang. The structure of gangs varies depending primarily on size, which can range from five or ten to thousands. Many of the larger gangs break up into smaller groups, cliques or sub-sets (these smaller groups can be called "sets" in gang slang.) The cliques typically bring more territory to a gang as they expand and recruit new members. Most gangs operate informally with leadership falling to whomever takes control; others have distinct leadership and are highly structured, which resembles more or less a business or corporation.