The analysis of IS implementation and lifecycle management theories concludes that, ERP systems or for that matter any information system is a socio-technical system; and the social, cultural, organisational and competitive context of their implementation cannot be ignored. Various institutional pressures are exerted on ERP initiation, adoption, and routinization by organisations to achieve competitive, economic, technical, environmental and organisational legitimacy and authority. There are theoretical supports available for environmental isomorphic mechanisms; however, comparing to tremendous amount of studies on coercive, normative, and mimetic, there are little studies that actually look at other organisational and internal institutional elements which are influencing technology implementation, assimilation and institutionalisation process. This research aims to fill this gap by introducing perceptive, confirmative, and configurative mechanisms as new forms of institutional isomorphism, i.e., organisational isomorphism.