Although you might hear multiple definitions in the marketplace,
Futurestep defines RPO as a highly customized, fully integrated single-source
in which expert consultants manage all of a client’s human
capital requirements, either on-site from their location or from the
provider’s. The goal is to attract the highest-quality talent while also
bringing improved processes and efficiencies to the organization. To do
this, providers leverage brand, leading-edge technology, proven
diagnostic and metrics, and their global reach.

Please explain the emboldened parts to me?
Marketplace-- the world of commercial activity where goods and services are bought and sold
Futurestep-- this is a company name
integrated single-source solution -- organized one-stop shop.
Students: Are you brave enough to let our tutors analyse your pronunciation?
Thank you Mister Micawber for your help in all of my threads.

But I can't understand "organized one-stop shop". Of course, I have looked "one-stop" up in many dictionaries but still I can't manage to understand.
Try reading [url=http://www.investopedia.com/terms/o/onestopshop.asp ]THIS ONE[/url], Gary.