40 (3.3) readily accessible and extended ICT Infrastructures (92) In the construction of major ICT infrastructures, it is required to foresee and project the conditions and/or activities likely to expand in the future and to apply technologies allowing readily expansion of infrastructures as necessary_ a) b) c) d) e) f) Cloud Computing Virtualization Infrastructure as a service (Iaas) Software as a service(SaaS) Platform as a service (PaaS) Pay-as-you grow model with transaction/outcome based pay-out g) Charge back model for ministries using the infrastructure And so on. (3.3.1) Usage of open-source systems (open standards) (93) It is required to use open-source systems initially in the implementation of e-Government systems. As Open-source Based Innovation of e-Government system is the major part of open standards-based system, it is a suitable system in the process of eGovernment. Thereby, it is certain to achieve the benefit of costeffectiveness in the long-term.