The purpose of the Foundation qualification is to confirm you have sufficient knowledge and understanding to work as an informed member of a Portfolio Office or in a range of portfolio management roles. The Foundation level is also a pre-requisite for the Practitioner certification.
The purpose of the Practitioner qualification is to confirm you have achieved sufficient understanding of how to apply and tailor the MoP guidance and to analyze portfolio data, documentation and roles in relation to a scenario situation. You should, with suitable support, be able to advise on the implementation of appropriate practices and techniques, and apply the method to a live portfolio, but may not be sufficiently skilled to do this appropriately for all situations. Your individual expertise, the complexity of the portfolio, and the support provided will also influence the impact the Practitioner can achieve.