Parent permission and involvement is very important and should be properly included. Projects should be judged. Judging is particularly important at the primary level. It should be used in constructive and encouraging ways. Every entrant should be a winner somehow.
Judges can be either peer groups or teachers or, and most preferably, from outside the school.
Judges can usually be found willing to volunteer their time from the community. Criteria for judging each project entry should be thought out in advance and clearly spelled out. Each entrant should receive a copy of the guidelines to follow. What a Science Fair is 1. It is an opportunity for students to display the results of some-thing that they have investigated and found out something about that they did not know before.