In the US there are guilds that have rules that decide who can claim what production and who is qualified to do what job. That is one of the main reasons why w

In the US there are guilds that have rules that decide who can claim what production and who is qualified to do what job. That is one of the main reasons why while film is really specialized ("gaffers", "grips") you can on a US production know you have people who know how to do what they are supposed. It lets huge movies staff up or staff down really fast. I am sure there are people who like the model or hate the model, but its creative success in the twentieth is hard to argue with. I think as work forces become more flexible, it is something to think about.