The number of Rows and Columns in the Response Grid is initially based on the size of the Roster. If the size of your Class is likely to fluctuate, add more Rows and/or Columns to the Response Map. Additional students can then be easily accommodated when they show up for a Session. If you don't have enough Response Boxes in the Response Grid and the Response Map hasn't been set up to cycle, when the Response Grid is full, additional Response transmissions will be ignored.