University spokeswoman Robin Kaler says individual instructors may not be showing up for class but she doesn't know how often that's happening. Nor does she know of any faculty members canceling classes because of the strike.

The strike began Monday morning after weekend contract negotiations broke down over the issue of whether teaching assistants would be allowed to attend the university for free. Union spokesman Peter Campbell acknowledges that graduate instructors now receive full or partial tuition waivers but that the union wants greater protection against any efforts to reduce or eliminate those waivers.

Kaler says there are no plans to make any change in the current tuition policy for the graduate and teaching assistants.