Social workers need to think about the relationship of the various system service. In his environment and environmental conditions that affect service, which might be a person. Family, group or community, then.
Social workers need to think about the relationship of users on the system. In his environment And environmental conditions that affect the service users, who may be individuals, families, groups or communities.
Social workers need to think about the relationship of users toward the environmental condition. Environmental effects on the user, which may be individual, family, group, or community then.