In a traditional slope stability analysis, it is assumed that the values of all model input parameters, are exactly known. This type of analysis can be referred to as a DETERMINISTIC analysis, and results in the location of slip surfaces with a minimum Factor of Safety.
A PROBABILISTIC slope stability analysis can also be carried out with Slide. In a probabilistic slope stability analysis, the user may assign statistical distributions to model input parameters, such as material properties, support properties, loads, water table location, etc.
By assigning a statistical distribution to one or more model input parameters, this allows the user to account for the degree of uncertainty in the value of the parameters. This results in a distribution of safety factors, and allows you to determine a Probability of Failure (or Reliability Index) for the slope.
See the Probabilistic Analysis Overview topic for more information.