With buddy diving, each of the divers is presumed to have a responsibility to the other. The actual legal responsibilities may vary between jurisdictions and are seldom if ever clear. The buddies are expected to monitor each other, to stay close enough together to help in an emergency, to behave safely and to follow the plan agreed by the group before the dive. When the system fails, it is generally because one of the divers does not fulfill his or her responsibilities as a buddy. If one of the divers is incapable of providing the expected assistance the buddy system has already failed.