What are the pricing models for Recruitment Process Outsourcing solutions?

When assessing pricing models for Recruitment Process Outsourcing (RPO) solutions, there is a lot of confusion in the market.  Most analysis tends to focus solely on the buyer or provider's perspective rather than reviewing the impact on both.  

This paper attempts to demystify the pricing conundrum by answering the following questions:

• What does RPO pricing include?
• What pricing models are most commonly used?
• What are the advantages and disadvantages to the various pricing models?