Sixth grade science continues the modular, topical, kit-based approach, of exploring various scientific disciplines each year, currently implemented throughout the Harvard Elementary School. Areas of study include primarily the earth science topics of Meteorology, Astronomy, and Earth History. A significant emphasis is placed on developing scientific process skills including careful observation, organization of data, and analysis of patterns and results. A continued transition toward the more quantitative methods of scientific analysis is fostered. These continue to be developed in later middle school years and high school.

Seventh grade science provides a hands-on introduction to laboratory science that helps students to master basic lab skills including safety practices, measurement skills (precision and accuracy) using common lab ware, science process skills of observation, data management and analysis (including quantitative treatment of data collection and analysis, graphing, and modeling), concluding and formal reporting. Students participate in designing, testing, and redesigning some aspects of their experimentation at several points throughout the year. Topical coverage draws from core biological and physical science topics which may include pre-chemistry, energy, life structure and function, evolution, ecology and body systems.

Eighth grade science provides a continued hands-on introduction to laboratory science that helps students master basic lab skills, including safety practices, measurement skills (precision and accuracy) using common lab ware, science process skills of observation, data management and analysis, concluding and formal report writing. Students participate in the technology/engineering cycle of designing, testing, and redesigning some aspects of their experimentation at several points throughout the year. Topical coverage draws primarily from chemistry and some basic physics concepts as well as applications of these to biological and earth systems. These may include structure of matter, chemical interactions, forces and motion, energy, and waves. Topics begin with conceptual coverage for understanding and continue to develop quantitative skills for managing data collection, pattern analysis, graphing and modeling. PSI begins a 2 year physical science sequence which continues into grade 9 with PSII (regular and honors).