What articles can I use with "maximum/minimum [noun]"?
Solution 1:
You haven't provided enough context to say definitively, but if the phrase is a heading or title, no article is needed. Article “a” would be incorrect (although one might say “A maximum of variability and openness”). Article “the” would be clumsy. Note, if you are describing a software product, variability is not a positive feature. Also, some may prefer maximal to maximum.