The main difference between a project manager and project management is [for those who understand management] the difference between having someone in charge and having everyone in charge.
Projects will get managed, albeit poorly, without a MANAGER.
Some companies don't want to pay for one.
Other companies want someone to assume the responsibility if there are problems.
Nature abhors a vacuum--some individuals manage by default.
Are we talking about Hiring a Project Manager? Project Manager Wanted.... or about assigning someone to manage the project.
"We're putting you in charge of the project. [Oh ,boy!] You don't have any authority over anyone in charge of any aspect of the project, you're just a sort of errand boy. I am putting you in charge because I lack the (real) authority, confidence, and ability to manage those guys, so I am letting them run amok and they need a flunky. You're it."
Real life is not pretty.
If you can't fire anyone, you are not the Project Manager.
Internal promotions negate any authority imputed to the manager of a project.
Or as I like to say....
"Everybody knows what everybody knows." From the Quotations of Slim Fairview (c) 2011
Copyright (c) 2011 Slim Fairview