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Design methods for reinforced soil structures may be divided into three components: a calculation procedure, material parameters and factors. The calculation procedure normally has two stages: external stability and internal stability. A calculation procedure is outlined for internal stability analysis based on a two-part wedge mechanism, which has the benefit of requiring very few assumptions to find a solution. In particular, no assumptions are made concerning the critical failure mechanism, and instead a large number of possible two-part wedge mechanisms are searched. This approach permits a number of important design situations to be modelled in a fundamentally correct way, including connection strength between the facing and the reinforcement and earthquake loading. The method has been formulated using the partial factors and general recommendations given in the AASHTO/LRFD guideline, and the resulting designs are in general very economical. However specific weaknesses such as low connection strength between reinforcement and facing may give a critical design condition.