Kids' Science Page. A good scientific research project involves a test of something where the results can be guessed at, but are not known for certain. You find out whether your guess is accurate by doing an experiment. The purpose of a science project is to discover something new.
Simple experiments are best.
If the experiment is too complex, unknown variables can interfere with the results. Even if your experiment does not work, or something unexpected happens, you will have learned something. Sometimes unsuccessful scientific research is used as a model for other experiments. Knowing that something did not work is actually knowing a lot. Scientists often study very complex problems.