Business process management is one of the core drivers of business innovation and is based on strategic technology and capable of creating and successfully executing end-to-end business processes. The trend will be to move from relatively stable, organization-specific applications to more dynamic, high-value ones where business process interactions and trends are examined closely to understand more accurately an application’s requirements. Such collaborative, complex end-to-end service interactions give rise to the concept of Service Networks (SNs).This book chapter surveys business process management, concentrating on business transactions, and introduces a business transaction language to realizes a novel business transaction model that enables end-to-end service constellations to behave according to agreed-upon transaction criteria. The objective of the BTL is to provide the environment to build robust and successful mission-critical SBAs, using a fusion of concepts from application integration, transaction-based and business process management technologies.