Possibly missed in this thread is the "origin" question.  Rather than "Should I 
use a colon or not?", ask instead "Why did we used to always use colons?"

My thought is that it tied in with Labels Use Title Case.  The label plus the 
field or control content made a "Title: Subtitle" comb.  The colon wasn't there 
just by chance; it was there to signal the end of the Title part, or the 
division between the two.

Today, much software no long uses Title Case.  Labels tend to be more sentence 
like in their structure, with the field or control content being the predicate 
or object of the sentence:

Choice for President: [John McCain]

... has become

My choice for President is [Barack Obama]

A colon is incorrect grammar in the new style of label; if anything, there 
should be a trailing period, but that would truly be visual noise (and would 
usually not sit just after the sentence predicate).

So I would say to use a colon if your labels are in Title Case, and not to use 
one if they are not.  (And if they are in Title Case, ask the question why your 
label design seems stuck in the 1990s.  There may be a deeper issue to examine.)

(Discussion of why Title Case was used -- and when it might still be best -- is 
another thread.)

-- Jim Drew
   UI/UX Software Tester
   Seattle, WA


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