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It is desirable that the user of any computer program for limit equilibrium slope stability analyses should be aware of the mechanics of the method that is being used but it is even more important that he or she have a thorough understanding of the principles involved in choosing the right geometry to be analyzed and in specifying the soil properties and pore pressures used in the analyses. It is beyond the scope of this manual to discuss these subjects at length but some guidance and some of the more pertinent references are offered in the following paragraphs.