Science and Mathematics Initiative for Learning Enhancement (SMILE)
Smile: Science Fair Information
A straightforward set of criteria for judging science fairs. No point system, just the criteria. Ideas to consider. Possibly too wordy.
Other
Science Fair Primer: Judging Guidelines
A five part set of standards (20 pts ea)of judging science fair prjects, with three to five criteria in each standard. These come from Falmouth High School.
Science and Mathematics Initiative for Learning Enhancement (SMILE)
Smile: Sample Science Fair Judging Forms
Two nice examples of documents you can use for judging science fair projects, one for judge registration, etc. and the other for actual project judging. This particular form comes from the Chicago public schools. Adapt it to your own...