Finally, don't include more than one variable on a graph or it gets confusing. Older students should give some statistical analysis of their data, such as standard deviation, anova or t-test. Have print large enough to read from a distance. Be sure that you understand all the terms and acronyms you present. Think about future experiments and how you could expand on a project.
Many students do science fair projects in consecutive years.
You should think about expanding and significantly changing your project, not just repeating the same project. For many schools, the Science Fair rush begins in January. To help in your experimental endeavors, use this hotlist of science fair related resources. The Exploratorium The Exploratorium Learning Studio receives many requests for help with science fair projects, both from teachers and students. We have brought together here some good places to start.