Complexity is a popular notion in Church leadership theory today. One Church leadership theorist puts it simply and clearly as follows: "The church is a complex system ... Complex systems appear to be self-organizing." The trouble is, though, the emphasis on self-organising. I have called it "faith in complexity". If it's not that, then it seems to come close. OBSERVATION: The "complexity theorists", I think, are right insofar as the Church is a bit of a disaster when it comes to wanting to run it, organise it, influence it, steer it, control it. However, I take the view that the Church is divinely directed, not self-organising. That, said one theologian, is what preserves ministers from worry. For interest, here is a "classic" statement of complexity theory and Church: Complexity Theory as Model and Metaphor for the Church.