Now, I have not really done much procedural control, but I do think jangler909 is spot on. I remember doing it in the proc sim at college many moons ago.
I use it in the radar environment to separate flights on SIDs, particularly slow piston aircraft that take forever to reach the 6000+ MSA (Watching PA28s climb out IFR is like watching paint dry)
It's a procedural seperation even it i see them on the scope, radar separation is no use on twisting and turning SIDs in that situation.
Still, comment about Africa still applies methinks......
