The paper highlights aspects important in the collection of field discontinuity data, reviews existing manual and computer-assisted stereographic methods of presenting and evaluating the field data for rock slope design, and describes a new computer method not based on stereographic projection. The new method uses sensitivity histograms to allow evaluation of failure potential and permits the effects of altering design parameters to be readily understood by engineers; it is also particularly good at handling weighted data. The method is, however, intended as an aid to presentation rather than as a replacement of existing stereographic methods as used by engineering geologists.

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