1. Reinforced soil retaining walls combine earth and linear reinforcement strips to resist tensile stresses that earth alone cannot. Henri Vidal first developed the concept by reinforcing a sandcastle with pine needles. 2. The document discusses the components, construction procedure, cost comparison, applications and benefits of reinforced soil retaining walls. It includes load transfer mechanisms, modes of failure, and principles of reinforced soil walls. 3. A literature review covers experimental and analytical studies on reinforced soil walls from 1992 to 2013 related to earth pressures, seismic performance, backfill properties, and geosynthetic reinforcements. Gaps in existing research are identified for further study.