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41 Table 9 Effects of Soil and Base Material Properties on Resilient Moduli Values (Richter 2006) field-based methods have been practiced for the determina- tries have already practiced or are in the process of imple- tion of MR properties (Theyse et al. 1996). An overview of menting mechanistic flexible pavement design using resilient the pavement design methodology by Theyse et al. (1996) moduli properties. noted that the design methodology was developed based on decades of pavement research in South Africa. This mecha- nistic design was reported to be well calibrated against the Summary experience of road engineers from various agencies in South Africa. This chapter describes laboratory tests practiced and studied in various U.S.-based investigations to determine the resil- Several other countries including European and Asian ient or stiffness properties of unbound bases and subgrades. countries reported the use of moduli for analytical pavement Laboratory studies are described in three sections, each design (Leksø et al. 2002). The majority follow AASHTO covering various years of research investigations performed test methods for moduli determination. The methods of with the support of different state DOTs. In each section, pavement design practices in these countries is still not well the salient findings from the presented literature review are known or not widely reported. Nevertheless, several coun- summarized.