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This study investigates the shear modulus degradation of soil. The study is based on a key parameter defined previously by the authors and called reference threshold shear strain. This parameter is defined as the shear strain for a stiffness degradation factor of G/G₀=0.7, in which G₀ is the very small strain shear modulus and G the secant shear modulus. The influence of some important factors on the reference threshold shear strain is discussed in this paper. Based on a previous proposed normalization methodology it is possible to define some unified relationships that allow the assessment of shear modulus degradation of soil.