Eric O worked for a medical device company. The medical device industry moves slowly, relative to other technical industries. Medical science and safety have their own cadence, and at a certain point, iterating faster doesn't matter much.

Eric was working on a new feature on a system that had been in use for thirteen years. This new feature interacted with a database which stored information about racks of test tubes, and Eric's tests meant creating several entries for racks of test tubes. And that's when Eric discovered that the database only allowed thirty racks. Add any more, it would just roll right back over to one.

This was odd. The database was small- less than 40MB, even in production- and there were automatic tasks to purge old data for compliance purposes. Why a hard limit of thirty?

Eric had only been at the company for a year, so he asked one of the more senior team members, Lester. "Oh yeah, that was before my time. You should probably ask Carl."

Later that day, Eric happened to bump into Carl around the coffee maker, and asked the question. "Oh, yeah, I do vaguely remember something about that. It was in the requirements for the product. I thought it was weird, but didn't think too much about it. You should probably ask Elise, she's been here like twenty years."

Well, now it was getting curious. Eric went over to the "old building", as it was named, the original office for the company on the other side of the parking lot. Most of the offices had moved to the new building a decade earlier, and it mostly served as fabrication and storage, but a few offices remained.

Elise was on the third floor, down a poorly lit hallway, sitting in an office with water-stained acoustical tile in its ceiling. "Oh, yeah, I put that into the requirements document. It's funny, I thought it was weird too, but the system you're working on was a replacement for an older system. Our requirements were derived from those. Let me think… Irving worked on that, but he's dead, god rest him. Penny is retired. Oh, you know, Humbert is still around. He didn't work on that, but he worked on some of the systems that came before that. He's upstairs and on the other side of the building."

Eric went upstairs and to the other side of the building. The fourth floor had been last remodeled circa 1985, and the ugly industrial paint on the wall was made even uglier by the fact that someone had replaced most of the flourescent tubes with LEDs. Most. The mismatched color temperature started Eric down the path of a headache.

Humbert was in an office similar to Elise's. On his desk was a plaque commemerating 40 years of service with the company. Eric asked about the limitation, and Humbert laughed.

"You're working on the latest version of a product that initially started on an old PDP-11 running MUMPS. I mean, the first versions, anyway. We ran to desktop computers as fast as we could. I wrote a version for DOS in… oh… '86? I knew none of the facilities we worked with had more than ten or fifteen racks of tubes, and I needed somehow to limit the size of the database so it all fit on a single 5 1/4" floppy disk. I picked thirty, because it seemed like a good round number. Honestly, I'm shocked that the limit still exists."

So was Eric. There had been several ground-up-rewrites since 1986, before the one Eric maintained had been released thirteen years ago. Each one of them had chosen to maintain the same limitation, without ever considering why it existed. The rule had simply been copied, mindlessly, for 40 years.

"I'm kind of impressed," Eric said to Humbert, "in a horrified way."

"Me too, kid, me too."

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