How do you determine this explicit ownership for issues? I've come across many governance problems linked to a lack of transparency in "bug ownership", but I've

How do you determine this explicit ownership for issues? I've come across many governance problems linked to a lack of transparency in "bug ownership", but I've often failed to find a common ground for clients and third parties: who's responsible? Who should pay for it? Quite often it's the one with the loudest mouth or the biggest sponsor who wins.