We want to know what is the best practice of when to add a person to a ticket. Here is what I think each option should allow.
We may have a non-agent who is a SME and we want him to follow along and comment to us when it is pertinent. we also want to know when to share instead of adding a participant.
"Share" was passive and could be an unlicensed, non-agent,
"Participant" was an agent that could actively make comments and change status on a ticket.
"Watcher" could be any user type - they are just "watching' the tickets activities.