Since the 1990s, the integration landscape has continually expanded, with new styles, patterns, products, and deployment models. Today, digital transformation agendas intensify integration's strategic business importance. Forrester's digital business integration research provides a coherent view of integration strategy that helps software teams get beyond silos of application, data, or other domains. This report outlines the landscape of integration service providers and advises application development and delivery (AD&D) pros on how to craft a shortlist in this space.