During recent project experience, Arthur D. Little has developed a roadmap to establish the optimal EtR Evaluation Model. It is suited to the management and organisational arrangements of individual Oil & Gas companies (e.g. Governance Model, Field Portfolio Differentiation, Size etc.), and applicable to International Oil Companies (IOCs), National Oil Companies (NOCs) and Oil Field Service Companies (OFSCs). The framework focuses on defining the optimal EtR Evaluation Strategy, deploying selected strategy that is fit-for-purpose (Process and Organization frameworks, Methodologies and Tools) and implementing it across the international business to establish an effective baseline for future assessments to exposure.