This engaging STEM lesson introduces primary learners (ages 7–11) to the real‑world engineering behind retaining walls, soil pressure, anchors, and structural stability. Designed for KS2 science and engineering enrichment, the resource blends clear explanations with hands‑on investigation, problem‑solving and real‑world application. Students explore how retaining walls work, why engineers use anchors, and how soil behaves when forces act upon it. The lesson includes a guided “Reactive Engineering Blueprint” activity and a practical “Risk Inspection” table that helps pupils think like engineers as they analyse stability, materials, and environmental conditions. What’s included: A full 14‑page teaching resource Clear explanations of retaining walls, soil pressure and anchors Real‑world engineering examples “Reactive Engineering Blueprint” thinking activity “Risk Inspection” student table Teacher guidance and suggested discussion questions High‑quality visuals and diagrams A recap page to consolidate learning Learning outcomes: Understand how retaining walls resist soil pressure Recognise the purpose of anchors and reinforcement Apply engineering thinking to assess risk and stability Develop scientific enquiry and problem‑solving skills Connect classroom learning to real‑world civil engineering This resource is part of The Surveyor’s Desk STEM series, designed to bring real engineering into the primary classroom through clear explanations, structured activities and professional visuals.