Compare different methods of slope stability analysis.

Limit equilibrium methods divide soil mass into slices along circular or non-circular failure surface. Bishop's Simplified - circular arc, satisfies moment equilibrium only, most common. Spencer's - satisfies all equilibrium, any surface shape. Janbu's Simplified - non-circular surfaces, less accurate. Morgenstern-Price - rigorous, satisfies all equilibrium with assumed interslice function. Finite element methods model progressive failure and deformation. FE is better for complex geometry, soil layering, and seismic analysis. Bishop is adequate for most routine analyses.