The nine lessons in this module introduce students to concepts related to structural strength. Students investigate the use of joints in structures, and design, construct, and test various framed structures. They also explore structures in nature. Also included: materials lists activity descriptions questioning techniques activity centre and extension ideas assessment suggestions activity sheets and visuals The module offers a detailed introduction to the Hands-On Science program (guiding principles, implementation guidelines, an overview of the skills that young students use and develop during scientific inquiry), a list of children's books and websites related to the science topics introduced, and a classroom assessment plan with record-keeping templates.