Controlling your pacing in the computer lab also helps when you have a class of varied experience levels. The theory behind Ask3b4me is rooted in problem solving and group support. The idea is that when students have a problem, they should ask at least 3 other students sitting nearby them for assistance before seeking help from the teacher. By doing this, students booster their confidence and self esteem as well as learning social interaction skills. Plan for the Worst Nothing is ever foolproof.
Computers sometimes go down or break.
So make sure that you always have hard copies of your lectures and backup plans if your class won't be able to use the computers at all that day. One policy that you need to remember is that some of your students may not be able to use computers due to parental choices. Make sure that you have alternative plans for these students. Even though it may seem much faster, your students will learn better if they have to do it themselves. When working over something that you have previously introduced in a class, try asking your student to walk through it themselves.