The methodology used for determining the rating estimation for drivers and passengers is based on the risk assumed by each one. This risk has been established taking into account the number of verifiable data, the elements that can be damaged, and the greater importance attached to the supply rather than the demand. With this in mind, it is assumed that a driver has more verifiable data and can suffer more damage as he/she provides the vehicle, with all its features and an up-to-date insurance. Thus, at least initially, the system assigns greater value to users who offer empty seats in their cars than to passengers who are looking for empty seats because, without an offer, it is impossible to meet a demand. Therefore, the scores of Table 2 have been adjusted according to that argument and taking into account that a parameter greater than three stars is considered a positive rating, less than three is negative, and equal to three is neutral. In addition, the system gives the driver added impact due to the fact that he/she provides more verifiable information.