The fundamental approach to this technique is that the transmission of very high energy waves moves through the compressible soil layer to improve its geotechnical properties at depth, causing significant densification to occur. The process begins with a test plot area of what specific grid spacing will be needed for the project and how much impact energy will be required to achieve the right amount of Compaction for the project. For example, the total weight, shape of the pounder, and drop height are critical items to be predetermined. Next, two different types of pounding stages happen. In the first stage, deep layers are compacted across the grid, and in the second stage, intermediate layers are pounded. After completion of the first two stages, the surface Compaction (sometimes called ironing) is carried out over the entire improved area.