Each campaign has a start trigger and if a contact meets the conditions they're added in. But what happens if a contact STOPS meeting those conditions while they're in a campaign? This is where trigger reversibility comes in.
At the bottom of the
start trigger tab you can choose what will happen if a contact stops meeting the conditions for the campaign's start trigger:
Choose stay in campaign and the contact won't leave the campaign unless they're specifically removed from it by a remove from campaign action:
Choose leave the campaign and Pathfinder will continue to monitor the contact while they're in the campaign. If their status changes and they no longer meet the start conditions, they'll be immediately removed from the campaign, no matter what stage they're at. If the same contact meets the start conditions at a later date, they'll be re-added back into the campaign from the beginning.
Note that if a contact has been removed from a campaign by a
remove from campaign action node they will not enter the campaign again, even if they meet the conditions of the start trigger. This is true irrespective of which trigger reversibility option you choose. In this case, once a contact has been specifically removed from a campaign they can only be added to it again if they are added to it by an add to campaign action from within a separate campaign.