An great overview and introduction to my favorite CMS, by Francesco on Smashing Magazine:

I think what resonates with a lot of people is that ProcessWire is a system that goes from simple to complex, not the other way around. It doesn’t assume what you want to build, but instead lays a strong, non-opinionated foundation by offering you effective, powerful tools and leaving the rest to you. That conceptual aesthetic has, to me, a certain appeal to it.smashingmagazine.com

I like the term "non-opinionated content management" to describe how ProcessWire will not make any assumptions on how you ...