Software-as-a-service (SaaS) applications have grown fastest in narrowly scoped point solutions, creating risk that user experience, business processes, and data insight will fracture across SaaS silos. To achieve coherent business operations, application development and delivery (AD&D) pros must connect across the silos using each SaaS vendor's distinct integration features. This report surveys the integration mechanisms commonly provided by SaaS applications and offers guidance on key usage scenarios for each type of mechanism.