Some great thoughts by Dimi and you might also find what Robert wrote in the Erlang Rationale worth a look 
These EF threads might also contain something of use?

Good luck and let us know how you get on 
Some great thoughts by Dimi and you might also find what Robert wrote in the Erlang Rationale worth a look 
These EF threads might also contain something of use?

Good luck and let us know how you get on 