Primo Central grouping is based on the existing FRBR workflow (see FRBRization), including the grouping process at the database level, the way the Search engine handles grouping, and the Front End functionality. It is used to prevent duplicate records in the results list.
In the Front End, the system displays the preferred record in the brief results list. Preference is always given to the original publisher's record over an aggregator record or pre-print. Users can view additional versions by clicking the View all versions link.