We have had really good success with two children on a computer. We have found, though, that having three children on a computer does not seem to work well. I am particularly interested because I plan to use some of the software for Confirmation Class starting this fall with 8th graders. I planned to have three on a computer and am now concerned about whether this will work. Size of the monitor.
Small monitors make the third kid have to lean in to see.
Size of computer table. If your computer has a mouse on the right side of the computer, then the person on the left or in back is physically unable to get control without playing musical chairs. A trackball can be passed to all students. There's a guide to coop learning with computers in the Teaching Tips section of my website. Younger children can't do worksheets, thus, this idea may not work for them.