Extended Bishop and GLE methods. Method of steepest descent as well as grid option for circular slip surfaces. More than 3000 slip circles in a single run. Noncircular slip surfaces can be generated as polygonal, composite, bezier curves and polygonal with fixed plane/ Interactive search for the critical non-circular slip surface. Linear and nonlinear failure criterion of hyperbolic type as published in EJGE 1996 paper. Versatile screen user friendly graphics/ Hard copy graphics via HPGL format. Verifiication document and Manual included.