Metrics

So, if part of becoming a missional congregation is a shift in focus from institutional to missional (internal to external), what kind of metrics do we use to measure that shift? It seems to me that most of the metrics we currently use in the episcopal church (Average Sunday Attendance, average pledge, budget, etc.), are all internally focused. I would love to be able to measure how people in the congregation understand their work as ministry, or how many in a week talk to someone outside the congregation about their faith and what it means to them. Anyone think of a way to measure things like that?