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The backcalculation program, GAPAVE, which uses the Genetic Algorithm (GA) and Finite Element Method (FEM), is developed to predict the layer moduli from Falling Weight Deflectometer (FWD) deflections. The use of the FEM in the forward calculation that incorporates the GA improves the accuracy in backcalculating the pavement layer moduli. The optimum GA parameters are selected from sensitivity analysis...