Gradient factors are the most popular method of implementing user selectable decompression profiles in technical dive computers. Gradient factors allow the diver some control of the initial stop depths and times of required decompression dives. If you aren't familiar with theory and practice of gradient factors, we suggest taking a few minutes with GRADIENT FACTORS by Matti Anttila, Ph.D. Originally published in 2007 for the IANTD Tech Diving Encyclopedia, this informative article gives excellent insight into understanding decompression theory and gradient factors.