I used to do an exercise in a classroom where one person had a map of Paris and directed the rest of the group from one spot to another using maps.

The ensuing melee demonstrated the concept of a system of communication better than all the lectures in the world. (They also had different maps, the person directing had simple one, those receiviing directions had a more complicated on) Red and White Rabbit is spot o0n in this regard.

Regards,

Dave