It isn't just computer science people that do this, either. My gut is it was a common thing in MBA style classes as a way to approach a topic in a field you are not expert in. Specifically, it is common among management talkers, from my experience.

I think the idea is supposed to be to go back to the "first principals [that you would have been taught]." Which, yes, sometimes you will learn things that show these early teachings were wrong. Often, though, you can get far more mileage out of the naive models than people want to admit.

To that end, I think used judiciously, this has merit. Rarely does anything go against early teaching. It should lean on the specific assumptions and why they do or do not apply anymore, though.

▲ godelski 21 hours ago | parent [-]

I think >90% of the time I hear the phrase "first principles" mentioned I'm safe in expecting something that is very high level to follow. I'm glad nerds have (kinda) been pushed into celebrity status but I also think there's a lot of cargo culting that has followed. Unsurprising I guess, since one is much easier than the other. I just wish there was more pushback, especially in tech (not because the only abuser of this, but we're definitely the ones with the most weight)

  > you can get far more mileage out of the naive models than people want to admit.

All models are wrong, but some models are useful, right? I'm a big fan of this phrase so much because I think it helps us remember that it's okay to be wrong.

I feel like the biggest problem of first principles is that this is almost never where you start. Rather it is something you work towards. Where it then becomes an iterative process expanding/extrapolating out, then coming back in and refining. Low level knowledge is so beneficial, but also very difficult to obtain. It's even more difficult to see how much room is below you without ever having gone down.

	▲	taeric 4 hours ago \| parent [-]
		Right, this is why I think people assume "first principals" means "first [learned] principals." It is almost always super high level and used synonymously with "back to basics." And fully agreed on your reasoning on why these are good phrases to keep in mind. I think I would pile on to the "becomes an iterative process" to highlight that "starting from first principals" is more likely to be where folks start. With advanced solutions expanded to cover more and more details that the initial assumptions could gloss over. I think this is largely justified, if only because "first principals" meaning "absolute foundation" are almost certainly still being discovered.