“…CAT 1 (GSI, 1998) [106] (CAS, 2002) [108] (PRIMA, 2003) [109] (VOMS, 2003) [110] ( Moodahi et al, 2004) [57] (GTS, 2007) [111] ( Pan et al, 2006) [112] (Warner et al, 2007) [113] (Koshutanski, and Mana, 2010) [114] ISO 7498-2 (Ahmed and Tripathi, 2002) [115] (Naqvi, 2006) [116] [117], [118] (GridAdmin, 2004) [119] (iAccess, 2009) [120] ( [121] ( Uddin et al, 2009) [125] (PowerTrust, 2006) [129] (TRMS, 2002) [131], [132] ( Dyson et al, 2004) [133] (PeerTrust, 2004) [139] ( Constandache et al, 2005) [140] (TrustBuilder, 2003(TrustBuilder, , 2009 [141], [ [49] (PathTrust, 2007) [152] (TVDs, 2005) [153] ( Gaeta et al, 2004) [155] (TrustCom, 2004) [156] (Svirskas et al, 2005) [157] ( Koshutanski, 2009) …”