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I'm writing a technical book, and I want to split my book up into about 3 to 6 very broad sections, each of which would have several chapters in it. Is there a standard name for these broad pieces that are bigger than a chapter? Unit? Part? Section?

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I think your first guess is the best, and the one I've seen most often in technical books-- Unit I, Unit II, etc. Keep the chapter numbering consecutive though; don't start over in a new unit. So Unit I might contain chapters 1-3, and Unit II might have chapters 4-6. Sounds good to me. "Part" is also apt and common. But there's no hard and fast rules-- pick what you think sounds best. Zebra I, Zebra II... – Aerovistae Apr 11 '12 at 4:30

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Usually it's called a part. A section is typically a cohesive chunk within a chapter. Nobody would know what "unit" means.

But grab a handful of big-ish technical books to see what they call the chunks.

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Section would work, too. – staticsan Apr 11 '12 at 4:26
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I went through about 15 technical books that I have, and 12 of them don't have anything larger than a chapter. So perhaps that means the "standard" approach is to just stick with chapters. Of the other three, two used "part" and one used "chapter" as the big sections with "item" being used for things that in most other books would have been called a chapter. I suspect that one is very unique in that aspect. While 2/3 isn't that broad of a sampling, perhaps it gives some credence to your point. – rbwhitaker Apr 11 '12 at 9:15
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I vote for "part." "Unit" is for a textbook. – Lauren Ipsum Apr 11 '12 at 10:03
"Part" is what I'm used to. A section is smaller than a chapter. (As one bit of evidence, the DocBook DTD calls for part - chapter - section in that order.) – Monica Cellio♦ Apr 11 '12 at 15:05
@MonicaCellio: That DocBook DTD is an interesting reference. Any idea on how widely used it is? At any rate, it's the first hard evidence I've seen one way or another, as opposed to everyone's "gut feeling". Thanks for pointing it out. – rbwhitaker Apr 11 '12 at 16:28
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up vote 1 down vote

Generally for books, part works, but for a technical book, if each bit can be treated as a single lesson in the topic, then Unit works well.

If they are merely different parts of a whole, and are different sizes, I would stick to part.

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I think you've got a good point about there being a small difference between "unit" and "part". – rbwhitaker Apr 11 '12 at 9:16
In my experience "unit" is only used with training materials (or textbooks). – Monica Cellio♦ Apr 11 '12 at 15:07
@MonicaCellio - yes, but if the book as a technical one can be used to do self-learning or such like, it makes sense. This even applies if the main usage is for reference, or bedtime reading. – Schroedingers Cat Apr 12 '12 at 10:40
I don't think "unit" in a tutorial would be out of place, but it would strike me as odd in a reference manual (something not designed to be read sequentially). But this could vary by domain, so it's best to see what others are doing with documents similar to yours. The people reading yours will probably have read theirs, after all, and that's a source of reader expectations. – Monica Cellio♦ Apr 12 '12 at 15:31
up vote 1 down vote

I don't see a big difference between "part" and "section". However, I would suggest something more descriptive than "Part One" or "Section 1". What do the chapters have in common? Why are the grouped together? It helps the reader if you could call them something like "Part One: Networking".

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I ended up going with "Part", because after looking over a lot of technical books, and getting feedback from here, I discovered that "Part" was used almost everywhere. People seem to use "Section" to refer to things smaller than a chapter. You answer brings up a great point, though, that the parts should be named, not just numbered. +1 for bringing up that point. – rbwhitaker May 12 '12 at 21:04

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