IS Internal Relationship Capability: This capability is the capacity of firm to build constructive internal relationships between IS users and IS providers to increase positive interactions in IS department and among firm’s departments. In SISP literature, researchers have shown the importance of joint vision [1], good relationships between IS users and IS providers [7], intercommunication [3], and good CIOCEO relations [8]. These collaborations enhance trust and respect in organization and amongst team members and therefore facilitate knowledge flow among members. Therefore, the second hypothesis is proposed: H2a, b: “IS internal relationships capability” has a strong positive relationship with (a) SISP objectives fulfilment and (b) SISP planning improvement.