The significant cost benefits of localisation have been recognised by a number of major oil and gas companies, but localisation is still an aspect of doing business that is poorly understood by much of the global industry. In the first section of this book, the authors provide the rationale for localisation and layout the core reasons for developing the tool. In the second section, the tool is described and the exact methodology is explained. In the final section the authors provide three case studies, demonstrating the tool in action and showing how we are able to measure the cost effectiveness and wider value of a coherent approach to localisation.