In order to determine whether a multi-employer scheme qualifies for PPF entry and how the scheme is treated for PPF purposes, and to calculate the PPF risk-based levy, it is necessary to understand whether the scheme is a segregated scheme or a non-segregated scheme. It is also necessary to understand what the rules of the scheme require on withdrawal of one of the participating employers, ie: • partial wind-up • no partial wind-up, or • the trustees are given the choice of implementing a partial wind-up For more information on PPF entry, see Practice Note: The Pension Protection Fund—eligibility and entry. For more information on the PPF risk-based levy, see Practice Note: The Pension Protection Fund—the pension protection levy. PPF entry and multi-employer schemes Where a scheme has only one participating employer, it is a single-employer scheme for PPF purposes. However, where a scheme has more than one participating employer, it is a multi-employer scheme and different considerations apply. The Pension Protection Fund (Multi-Employer Schemes) (Modification) Regulations 2005,