[Jeff Rodriguez]

It seems like it would be a lot of work for one teacher.

Are these two groups building one robot or two?
If they're building one robot, what would be the benefit of two groups?

I also think it will be very hard, maybe even impossible to keep the students from talking with one another. The students will naturally talk to each other during the school day. The teacher can't regulate ALL communication between the two groups, just what occurs during the different days.