CVSoil is a complete and innovative tool for the determination of characteristic geotechnical parameters according to a probabilistic approach, considering the statistical quantities obtained from a suitable sample of tests. With the introduction of the concept of limit state was developed in parallel also the concept of characteristic value. Eurocode 7 concerning the geotechnical design, introduces for the first time the characteristic values ​​of geotechnical parameters. The characteristic value, understood as a precautionary estimate of the parameter which influences the onset of the limit state into consideration, must be used in any type of geotechnical verification. The works must be verified for the ultimate limit states that may occur as a consequence of different combinations of actions and for the serviceability limit state, defined in relation to the expected benefits.