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Not sure what this is called, but I have seen the following phrases with and without dashes:

The doctor performed a well-documented procedure.

Or:

He took an often-used road to the farm.

What are those 'contraptions' called, and should dashes be used or do they go separate (well documented and often used)?

  • The question being: since "well" is an adverb, not an adjective, we do not hyphenate "well documented". "The doctor performed a well documented procedure." The adverb "well" cannot modify the noun "procedure" so there can be no confusion. – GEdgar May 13 '18 at 13:36
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Both uses you've quoted should use a hyphen. You may see the same phrase without, as in "the procedure was well documented", where the hyphen isn't necessary. In both the examples you show, there's not much room for confusion without the hyphen, but in similar constructions there may be. Finally there is a difference between a hyphen and a dash (of which there are two main types and several uses). Here it is a hyphen that is required—which is the easy one to type in. For more detail see "dash" on Wikipedia.

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    I've used this example in a comment elsewhere, but perhaps it's worth repeating here: (1) the longest living creature, (2) the longest-living creature. The hyphen shows that the 'longest' modifies the 'living'. Without it, it could mean 'the longest creature that is living.' – David Garner Feb 4 '15 at 12:47
  • @DavidGarner, that's a very clear example and better than any I could think of earlier. I was fairly sure this was a duplicate question but searching on my phone is a fiddle. – Chris H Feb 4 '15 at 19:49
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The question being: since “well” is an adverb, not an adjective, we do not hyphenate “well documented”. The doctor performed a well documented procedure. The adverb “well” cannot modify the noun “procedure” so there can be no confusion.

Similar: an awfully big adventure and not an awfully-big adventure.

When “well” is replace by something not clearly an adverb, then probably you should hypenate: the three-hour tests

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added
A comment by @Chemomechanics suggests I am wrong. And I have come to the conclusion that I am, indeed, wrong.

Fowlers' Modern English Usage (3rd edition) even has an entry on well and well-. They note “widespread uncertainty” on well followed by a participle. But they advocate a hyphen for attributive uses (a well-documented procedure) but not for predicative uses (The procedure is well documented).

personal
As a mathematician I often see “well ordered set” and similar phrases in mathematical literature. My original tendency was to write it with hyphen (well-ordered set) and found that was not the standard, so I tried to wean myself from that practice and write without (well ordered set).

But today, prompted by Chemomechanics’ comment, I did some searches of mathematical literature. To my surprise, nowadays “well-ordered set” far outnumbers “well ordered set”. I guess I can therefore lapse back to my original tendency.

Of course, by the rule quoted in Chemomechanics’ comment, I should still write the -ly cases without hyphen: "partially ordered set", "totally ordered set", "linearly ordered set".

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