I was discussing this topic in a chat over on PMSE and figured I'd pose it to the experts.
Should the 'a' in the word 'agile/Agile' be capitalized? Specifically, when referring to the concept brought about by the Manifesto for Agile Software Development.
On one hand, the term agile may simply apply to the adjective of agility, which coincidentally is part of the title of the Manifesto for Agile Software Development.
On the other hand, it's feasible that 'Agile' is actually an abbreviation of the 'Manifesto for Agile Software Development'. Similar to how 'Manifesto' would be - the vernacular has merely decided 'Agile' as its abbreviation rather than 'Manifesto', presumably due to less ambiguity. And, as far as I know, the abbreviation of a proper noun ('Manifesto for Agile Software Development') should be capitalized. Of course, it could be argued that 'Agile' is referring to the concept brought about by the Manifesto, rather than the Manifesto itself. If so, should it then be considered a proper noun in its own right, or no?
As requested, some examples (emphasis mine):
The difficulties with requirements gathering and how they change are one of the reasons for the "agile methods."
What mechanisms promote continuous improvement on Agile teams?
The term agile management is applied to an iterative, incremental method of managing the ...
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