For example, in order to compute the trust rate TRAB in user A regarding his relationship with user B, the required calculations are as shown in Equation (6). (6)DTAB=(78×0.273)+(19×0.727)40.822×0.625+0.75+1+0.5+0.5+0.75+0.56×0.375=35.10740.822×0.625+46×0.375=0.537+0.25=0.787.