There are many more less obvious mistakes, but the following 10 are ones that I have encountered the most. If you need help, ideas or have comments, send me some email . You can always read my book too. It details these and many other mistakes, as well as, the keys to success. Too many kids, not enough computers.
Enthusiasm can turn into chaos with too many kids.
The answer may be to control the number of kids, not rush out an buy another computer. Too many computers, not enough teachers. It's amazing how many labs I've seen with only one teacher no matter how many kids or computers. Get some help. An extra teacher and a teen or two can make or break your lab.