This document provides guidance on preparing a science fair project. It explains that a good project has a topic of personal interest that is neither too easy nor too difficult, uses readily available materials, and allows for experiments or investigations. It discusses including background research, experiments that control variables, studying machines, and explaining scientific concepts. The best projects are neatly designed, thorough, include photographs, use the scientific method, have detailed records, interesting models and displays, graphs charts, are visually attractive, original, and allow the exhibitor to clearly explain their work.