This publication provides introductory technical guidance for civil and geotechnical engineers and other professional engineers and construction managers interested in learning retaining walls and excavation support systems for buildings and a variety of infrastructure features. Here is what is discussed: 1. DESIGN CONSIDERATIONS FOR RETAINING WALLS, 2. EARTH PRESSURES, 3. EQUIVALENT FLUID PRESSURES, 4. DESIGN PROCEDURES FOR RETAINING WALLS, 5. CRIB WALL, 6. EXCAVATION SUPPORT SYSTEMS, 7. STRUTTED EXCAVATIONS, 8. STABILITY OF BOTTOM OF EXCAVATION, 9. ANCHORED WALLS