From a social science research perspective, it's the long-term sustainability of the peace. Peace can be defined both as negative peace and positive peace, if we go back to Johan Galtung's academic perspective. I want us to take that in stride because in peace and conflict studies we look at what the tenets or hallmarks are of a peaceful society, and peacekeeping is not necessarily intended to get us right to that end state—the hallmarks of a peaceful society. It's supposed to create an environment in which peace can take hold.
Chapter VII allows for a wider remit of the use of force, so, possibly, the mission mandate will be realized sooner, instead of perhaps starting with a chapter VI, and then, every year, as that emergent insecure environment continues to become more threatening, converting over to a chapter VII.
How would we measure mission success? It all goes back to the actual mission mandate, what the UN says is successful, and matching it up with what its mission mandates were. If there are metrics to use during the mission, they're typically related to whether or not—as the other witnesses suggested—training was required, what was missing, what the gaps are, and whether or not those mission mandates were attained.