While Ratio Decompression is not a complete decompression model, it most resembles those of Bühlmann algorithm, and the Varying Permeability Model algorithm, with emphasis on the use of deep stops and gradient factors.
However, these models do not describe the individual physiology of the diver accurately: divers have been known to suffer symptomatic decompression sickness whilst diving within the limits of dive tables or dive computers (sometimes referred to as an "undeserved hit"), and divers have exceeded No Decompression Limits but remained asymptomatic.
The physiology behind the off-gassing of nitrogen or helium absorbed by the body from breathing gases under pressure has never been definitively established, particularly in relation to the formation of bubbles in the body's tissues, and a number of different algorithms have been developed over the years, based on simplified hypotheses of gas transport and absorption in body tissues, modified to fit empirical data, to predict the rate of off-gassing to reduce the risk of decompression sickness in divers to an acceptable level.
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