This document discusses IBM's hybrid integration reference architecture for digital transformation. It describes how new digital technologies are disrupting businesses and requiring companies to find new ways to innovate, reach, and engage customers. It introduces Systems of Record (SoR), Systems of Engagement (SoE), and Systems of Interaction (SoI) as the new IT systems paradigm that can transform operations and business models. It also summarizes three primary trends driving the integration market: integration being adopted in lines of business, increasing need to integrate across hybrid environments, and the API economy and microservices.