Clarifying Congregationalism

There are many ways which are suggested for establishing whether a Congregational Church is Congregational (Congregationalism is one of three major forms of Church government). Here's a question which does a good job of clarifying it I think: "Is the diaconate driving the Church, or is the Church driving the diaconate?" What do you feel spontaneously? If it isn't obviously: "The Church is driving the diaconate," then the Church may not (in practice) be Congregational. OBSERVATION: A "diaconate" is a Congregational leadership, which includes deacons and (sometimes) elders. Traditionally, both.