> Obviously the secretary won't do a simple message count, but try to take substance and length into account, but it is the primary feature under evaluation, as

> Obviously the secretary won't do a simple message count, but try to take substance and length into account, but it is the primary feature under evaluation, as it's written. Substance and length are the second and third criteria. The list isn't ordered, so I don't think one could call a particular criterion "primary".