Trac Workflow Chart

Reporter - This is not necessary a person who created/reported a ticket. Ticket Admin can create ticket with any user as Reporter or modify Reporter on existing ticket. Reporter is a person who is responsible for testing, returning ticket to a developer if it needs more work or closing ticket if test is successful.

Owner - a person responcible for implementation/development. Usually tickets are assigned to developers, but can be assigned to testers if no development required.