With more than 1 billion smartphones worldwide, and tablets numbering in the hundreds of millions, the scope of the mobile revolution rivals that of the move from monolithic systems to client/server computing in the 1990s. As in that period, we're now seeing massive changes to application architecture as companies modernize the way they build applications. Modern applications require multichannel clients, elastic infrastructure, and elastic licensing; they're composed of multiple service endpoints that are provisioned by developers with direct customer feedback on their convenience. This report, which is the vision report of the mobile app development playbook for application development and delivery (AD&D) professionals, focuses on the changes application developers need to understand if they want to build modern applications that deliver contextual customer experiences. It also looks at how modern applications will evolve over the next few years and what development teams should prepare for now.