Factor of Safety (FOS) and Strength reduction factor (SRF)
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Gravity loads are generated automatically in manner described in section 3.8 of the present documentation. This load is applied to the slope in a single increment. A trial strength reduction factor loops gradually weakness the soil parameters until the algorithm fails to converge. The factored soil strength parameters that go into the elastoplastic analysis are obtained from:

(221) 
where SRF is strength reduction factor. Several increasing values of the SRF factor are attempted until the algorithm fails to converge, at which point SRF is then interpreted as the factor of safety FOS. This actually means that no stress distribution can be achieved to satisfy the failure criterion and global equilibrium.

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