<p>The Falling Weight Deflectometer (FWD) is widely used in nondestructive assessment of in situ modulus of flexible pavement layers. To estimate the modulus of asphalt layers it is necessary to adjust the deflections or backcalculated moduli to a reference temperature. Likewise, backcalculated modulus of other layers that conform the structure must be adjusted in order to make them comparable to those obtained in laboratory tests. This article aims to make a review on existing factors to adjust the backcalculated modulus, obtained by using information from deflections basin with FWD, and make them consistent for use in pavements. It is concluded that there are many investigations to determine these correction factors, so it is important the engineering criteria when selecting the correct factor to apply, doing possible to estimate with a good degree of confidence the service condition of pavement layers.</p>