How do we measure the effectiveness of the missional church?

One of the challenges for any “social enterprise” is to measure its effectiveness or impact. The missional church is becoming more like a social enterprise, perhaps for good reasons, but if “success” is not being measured primarily in terms of church growth or conversion rates, how do determine the theological validity of what we are doing? I suggest in two articles here that, against the background of a large scale transformation in what it means to be human, we can usefully redeploy the New Testament missional paradigm, and on that basis begin to define the chief markers of effectiveness.