# North American Computational Linguistics Open (NACLO) The North American Computational Linguistics Open (NACLO) is a prestigious, puzzle-based linguistics competition designed to challenge middle and high school students in grades 6–12. Organized by the NACLO Organizing Committee, this free program bridges the fields of linguistics, computer science, and logic by presenting participants with engaging problems that simulate real-world computational linguistics challenges. Through its open and invitational rounds, NACLO offers students an intellectually stimulating opportunity to explore the intersection of language and technology in a fun, competitive format. ## Program Structure NACLO is offered in a **hybrid format** with opportunities for both in-person and virtual participation, making it accessible to students across the United States. The competition consists of two main stages: 1. **Open Round**: This initial round is open to all eligible students and consists of a series of linguistics puzzles. These puzzles require logical reasoning and creative problem-solving to decode and analyze patterns in unfamiliar languages. 2. **Invitational Round**: Top performers from the Open Round are invited to participate in the more challenging Invitational Round, where they solve advanced problems and engage with complex computational linguistics concepts. Each round typically lasts several hours and takes place on specific dates during the academic year, with the Invitational Round following the Open Round by a few months. The program is designed to be a single-day commitment for each round, making it manageable for busy students. ## What Students Experience Participants in NACLO tackle intellectually stimulating linguistics puzzles that require logical thinking, pattern recognition, and analytical skills. These problems mirror the types of challenges faced by computational linguists in areas such as machine translation, speech recognition, and natural language processing. Students do not need prior knowledge of linguistics or computer science to participate—success depends on reasoning and problem-solving abilities. Through NACLO, students develop valuable skills in logic, critical thinking, and structured reasoning while gaining exposure to the growing field of computational linguistics. For students who advance to the Invitational Round, the experience can also include mentorship and feedback from experts in the field, as well as opportunities to deepen their understanding of the discipline. ## Why It Matters for College Applications Participation in NACLO demonstrates intellectual curiosity, problem-solving ability, and a strong interest in STEM fields, particularly at the intersection of linguistics and computer science. Excelling in the competition, especially advancing to the Invitational Round, can be a standout achievement on college applications. NACLO highlights a student’s ability to tackle complex, interdisciplinary challenges and showcases their potential for success in competitive academic environments. Additionally, NACLO’s focus on computational linguistics—a cutting-edge field—can distinguish students applying to STEM or linguistics programs. ## Eligibility NACLO is open to students in grades 6–12 who reside in the United States. No prior experience in linguistics, computer science, or related fields is required, making the competition accessible to anyone with a passion for puzzles and problem-solving. The competition is entirely free to participants. ## How to Participate Students can participate in NACLO by registering through the official website. Registration typically opens several weeks before the Open Round, so it’s important to check the site early for deadlines and instructions. On the day of the competition, students can choose to participate either at designated in-person locations or online, ensuring flexibility for a wide range of participants. For more information about NACLO, including practice materials and updates, visit the [official NACLO website](http://www.nacloweb.org).