One point I think bears mentioning, if one is considering the second approach,
is this:
The key phrase should form only part of each article's title.
What sometimes happens is the author posts the initial article with a title
consisting of the key phrase only, and subsequent articles have that title plus something like "Part
N" appended. This is a problem, if the idea is to
have they key phrase serve as a way of findably grouping the articles together.
For example:
Those title searches hit the "root" posts exactly, so you miss the subsequent articles, i.e.
This mistake was also made in the previously mentioned
Balls! series.
To see what happens when this mistake is avoided, check out title searches such as
Perl Idioms Explained, The Lighter Side of Perl Culture, and The Drama of Being a Developer.
This leads to a corollary principle:
The key phrase in the titles should have uniqueness wrt all other posts not related to the series.
(I was a little concerned that
Refactoring Perl doesn't have sufficient uniqueness; but it does — for the time being, at least.)
Example: a title search for
I Hate C turns up a ton of unrelated stuff,
in addition to the desired hits,
I Hate C, part I and
I Hate C, part II.
A word spoken in Mind will reach its own level, in the objective world, by its own weight