Mechanically Stabilised Earth (MSE) walls have a growing application in place of conventional retaining systems for varying reasons, most notably economy and constructability. However, there have recently been a number of failures or instances of poor performance of these systems throughout the southern African region. An evaluation of these indicates that there are two fundamental causes for poor performance. Th e ﬁ rst relates to the nature in which MSE structures are planned, designed and constructed. Th e second relates to the need for the geotechnical designer to develop a clear understanding of the subsurface conditions, together with a need for routine veriﬁ cations of the ground conditions, design, construction and materials during the process of construction.