Selected conference papers later appear in special issues of journals, and the connection between these versions should be identified. A farm has fields to plow, tractors to do the plowing, and farmers to ride the tractors. Fields have names, tractors have serial numbers and farmers have names and the number of years that they've worked the farm. The date that a field was plowed, and by whom, and with what tractor, is kept. Internal courses have some number of continuing education credits.
External courses don t, but the names and phone numbers of enrolling patrons are logged.