Subclassing for versioning, eh? I remember talking to a friend in the early 90s who was doing that at the company he worked at.

I was reading about SCCS at the time, and wanted to convince my management to use that, but couldn't get them away from the "directory tree per release version" method.

My next job in the mid 90s used RCS, and I've never worked at a job since that didn't use some kind of version control / archive software. Hard to fathom that some organizations still avoid version/revision control. How do you "undo" to yesterday when you change your mind about something???