This book is disseminates the research results and best practices from researchers and practitioners interested in and working on modelling methods and methodologies. Though the need for such studies is well-recognized, there is a paucity of such research in the literature. What specifically distinguishes this book is that it looks at various research domains and areas such as enterprise, process, goal, object-orientation, data, requirements, ontology, and component modelling, to provide an overview of existing approaches and best practices in these conceptually closely-related fields.