## Saturday, July 31, 2010

### Eating your own dog food in the 1960s

It's common in the software industry to hear the phrase "Eat your own dog food". It's so common that Wikipedia has a page dedicated to the phrase. The idea is that a software developer should also be a user of the software they are developing. By analogy someone making dog food should make it good enough that they'll eat it themselves.

The phrase has been around since at least the 1980s, but I recently came across a much earlier expression of the same idea. And this came from one of the X-15 test pilots: Milton Thompson.

Some models of the X-15 contained a device that mixed the aircraft controls of the X-15 with the rocket controls. Since the X-15 would fly like a plane and a spacecraft it had both conventional airfoils and thrusters. These were originally controlled by different joysticks. The mixing device was the MH-96 and enabled the pilot to fly the X-15 in the atmosphere or in space using a single joystick.

But that meant that the MH-96 was controlling the X-15 with the input of the pilot. And so the pilot had to trust the MH-96 itself. Thompson wrote "As a pilot, you hope the guy who designed this electronic control system knew what he was doing. In fact, you would like him to be in the airplane with you to be exposed to any adverse results." Now, that's eating your own dog food.

More recently I had the pleasure of chatting with Sven Strohban who was the lead engineer on Stanley, the car that won the 2005 DARPA Grand Challenge.

He told me that he had a simple technique for ensuring high quality. When a software engineer told him that their module was ready for testing in the autonomous car, he would say: "OK, we'll load your code and you can sit in the car while it drives you around". Invariably, the engineer would need just a little bit more time before declaring his code ready.

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If you enjoyed this blog post, you might enjoy my travel book for people interested in science and technology: The Geek Atlas. Signed copies of The Geek Atlas are available.

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