Since multiple campaigns run at the same time on a typical OpenX Ad Server implementation, it is essential to understand how often they will be delivered. The OpenX system uses Campaign Weight and Priority Level naming to evaluate the banner impressions percentage of a campaign.
If there are Contract (Exclusive) campaigns for certain website zones, the others are neglected. If there are Contract campaigns, Remnant campaigns will not be delivered.
Each campaign type is prioritized only in its group. While Contract type gets Priority Level naming, Contract (Exclusive) and Remnant campaigns get Campaign Weight naming as a term for prioritization in its own group.
The following sample chart shows how OpenX basically decides which campaign to give priority, thus a percentage of total inventory impressions. Please, note that we assume all campaigns target the same zone.
The last three campaigns will not be served because of the running Contract (Exlusive) campaigns...