A great piece, from Tim Keller, on what makes a ministry movement and how it differs from an institution:
The word “movement” is often used to describe a kind of vital, dynamic human organization, in order to distinguish it from what are called “institutions.” Both of these words can have broader meanings, but for the sake of this discussion let us define them in the following ways.
A movement is marked by an attractive, clear, unifying vision for the future together with a strong set of values or beliefs. The content of the vision must be compelling and clear so that others can grasp it readily. It must not be so esoteric or difficult that only a handful of people can articulate it. Instead, it must be something that all members of the movement can understand and pass along to others. By contrast, “institutionalized” organizations are held together by rules, regulations, and procedures, not by a shared vision.