This document provides guidelines for judges to evaluate science fair projects. It outlines the criteria used to evaluate projects, which includes the research question/problem, design and methodology, execution, creativity, and presentation. Projects are judged on a 100 point scale, with 45 points for the project itself, 20 points for creativity, and 35 points for the presentation/interview. Guidance is provided on evaluating various aspects of the project like the research question, design, data collection and analysis, reproducibility, and understanding by team members. Tips are also provided for finalists preparing for their interview.