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Απο το US Navy Diving Manual - σελ 9:30

Order of Repetitive Dives. From the decompression standpoint, the most efficient way to perform repetitive dives is to perform the deepest dive first and the shallowest dive last. This pattern yields the most bottom time for the least decompression time. There is no prohibition on performing repetitive dives in the reverse order, i.e., shallowest dive first and deepest dive last, or in any random order if the operational situation requires it. It is just that patterns other than deep to shallow are not the most efficient in terms of decompression.