Based on a current layered elastic pavement theory, the concept of a solution of the global minimum, an orthogonol searching technique and associated computer programs are presented to overcome the non-unique solution issue and to obtain user Independent results in backcalculatian of moduli. This non-unique solution Issue has caused practitioners and pavement designers to lose their confidence in the backcalculated modulus values and become skeptical about the blackcalculation practice This issue is the topic that this paper is intended to address. A review of the recent international developments in backcalculation of moduli reveals that the backcalculated values of moduli are software and user dependent. Extensive studies have been done on backcalculation of moduli associated with the Falling Weight Deflectometer (FWD) evaluation of road and airport pavements.
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