The growing complexity of information systems reflects the trend of intensified mobility and changeability of business processes in our increasingly interconnected world. Most of business processes implementations rely on software systems in their operation. Therefore, when business process changes, corresponding software should be quickly and correctly updated. Existing software architectures and development processes typically cannot provide efficient and quick adaptation to changes in requirements. This book explores the idea of using formal domain specifications (ontologies) and task models to build software which could be quickly adapted to domain changes. In our opinion the topics discussed and solution proposed in this book will be interesting to everyone involved on software development or operation, including information technology students, software developers, business analysts and managers.