The programs are now available to about 62 million Americans, through internal departments or outside consultants on contract.
The school also has an internal post-16 department which accepts students from all schools across the Plymouth consortium.
It also shows the relationship between the internal departments and sub-systems.
It may be undertaken by an external body or an internal department that reports independently from the program manager.
Being internal departments within postal administrations, little information about the dead letter office function has ever been made public.
"With which internal department would you like to link?"
The internal departments are dependent of one another and they need to work together if the company is to be successful.
Rather, since 2005 it has been operated as an internal department of the Credit Union.
It was formerly an internal department of National Grid and is now an independent company.
Every major Hollywood studio and movie distribution company has an internal department devoted to promotion.