The agreed schedule for revision of the current sardine-anchovy Operating Management Procedure (OMP) requires the pre-2010 data to be considered in conditioning the Operating Models (OMs) for OMP testing to now have been finalised (de Moor 2010). That deadline also relates to the broad alternative stock structure assumptions to be considered. This document sets out these assumptions as currently understood by the authors to confirm their agreement within the SWG-PEL.