This book analyses the legal obstacles associated with the advancement of unitization processes and procedures at a national, domestic level. It uses case studies of identified jurisdictions with relevant States practice and unitization experience in terms of the domestic legal framework and practices. For experience in unitization, the book will focus on the following countries: the United States, Canada, the United Kingdom, Norway, Brazil, Mexico, Ghana and Nigeria. Focusing on best practices which have influenced the development of the unitization concept, the book looks at the formulation of different models and operating agreements, and their potential impact on unexplored hydrocarbon resources, particularly in cases where unitization is necessary. The book will be of interest to practitioners, scholars and students in the field of natural resource law, international law and unitization.