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To reduce the number of iterations required to solve the problem the user should estimate the factor of safety as well as the angle of inclination of the side forces . The initial factor of safety has a default of 3 and the default for is one-half of the slope angle, as a reasonable estimate for the initial estimate of .

Allowable force and moment imbalances are established by the program. A description of the force and moment imbalance is given in the theoretical background section . It is suggested that appropriate values for the maximum acceptable horizontal force imbalance and the maximum acceptable moment imbalance are given by

· H³ · c   and    · H² · c   respectively

= approximate average unit weight for slope
H = height of slope
The default values for c are 10 and 100 respectively.