This rubric is designed to assess student performance in Grade 10 Sciences with a primary focus on Chemistry and integrated Biology concepts. It provides clear criteria for evaluating knowledge; skills; and understanding across key scientific domains. The rubric measures students’ ability to apply chemical principles; analyze biological systems; and demonstrate critical thinking through experiments and problem-solving. Students are assessed on their mastery of core Chemistry topics such as atomic structure; chemical bonding; reactions; and stoichiometry; while also integrating Biology concepts like cellular processes and environmental interactions. The rubric evaluates both theoretical understanding and practical application; ensuring students can connect concepts across disciplines. By using this tool; educators can provide targeted feedback to help students improve their scientific reasoning and laboratory skills. The rubric emphasizes inquiry-based learning; encouraging students to design experiments; interpret data; and draw evidence-based conclusions. It assesses communication skills; requiring students to articulate scientific ideas clearly using appropriate terminology. Collaboration and safety in lab settings are also evaluated; fostering responsible scientific practices. For students; this rubric offers a transparent framework to self-assess progress and identify areas for growth. It supports differentiated learning by outlining clear expectations for achievement at varying levels of proficiency. Teachers benefit from a consistent; objective tool to measure student performance and guide instructional planning. By integrating Chemistry and Biology; the rubric reinforces interdisciplinary connections; preparing students for advanced science courses and real-world applications. Overall; it promotes a deeper; more cohesive understanding of the sciences while developing essential analytical and experimental skills.