Trustee: The recent exhibit at the art museum was extensively covered by the local media, and this coverage seems to have contributed to the record-breaking attendance it drew.
Conclusion (so)
The museum could not have remained open had it not been for the coverage from the local media.
Evidence
The museum could not have remained open if the attendance at the exhibit had been low, and the coverage from the local media contributed to the record-breaking attendance.
Evaluate
To argue against this conclusion, we're trying to think about how we can make the case that .
We have a logic rule we have to deal with -- it couldn't have remained open if the attendance at the exhibit had been low. So we'll need to argue that .
We know that the media coverage contributed to record-breaking attendance, but without media coverage would attendance have still been pretty strong?
Remember, we don't need there to be record-breaking attendance. All we need to make our case is the possibility that attendance would "not have been low".
Formally, the conclusion is trying to argue this: Without ---------------------------------> museum media closes
The evidence presented is this: Without --> less low --------> museum media attendance attendance closes
The missing link is whether .
Goal
The author never established that the local media coverage was necessary to avoid having low attendance. She's assuming that .