Ground improvement involves the modification of poor ground conditions or constructing inclusions within the ground to achieve required project performance. The mechanism of achieving ground improvement varies by technique and soil conditions. Densification by means of vibration or displacement is an effective means of improving granular soils. Reinforcement involves constructing or inserting stiff elements within a soil mass to create an improved composite material. Soil can be improved by adding cementitious materials by either permeation in granular soils or mixing in all soil types. The insertion of vertical drains decreases the amount of time it takes soils to settle and strengthen when subjected to a surcharge load.