CIOB EPA Level 4 Design and Construction Management Practice Test

Lean Construction aims to improve project efficiency by reducing waste and improving flow across planning, design, and construction. The best answer ties efficiency directly to minimizing waste and maximizing productivity. When waste is eliminated—unnecessary waiting, defects, overproduction, excess movement, and inventory—the project runs smoother, with fewer delays and less rework. At the same time, productivity increases because more value is created per unit of input, meaning you get more output from the same resources. This fits Lean practices like the Last Planner System and pull planning, which focus on removing bottlenecks and speeding up delivery. While standardizing processes and eliminating waste is helpful, the overall aim is the combination of waste reduction and productivity gains. Lean also spans the entire project life cycle, not just the design phase.