From the development of an overarching vision to the delivery of specific requirements, ATIS plays a pivotal role in the communications industry’s advancement of the concept, objectives and capabilities for 5G systems. In 2015, ATIS produced the white paper “5G Reimagined: A North American Perspective,” which defines a vision of 5G incorporating both incremental and innovative aspects of the 5G network—how 5G will evolve from the current network and what its potential will be. Both incremental and innovative perspectives are crucially important in terms of positioning network operators to leverage 5G to advance their business models. In 2016, ATIS is fast-tracking its work to develop detailed 5G specifications. ATIS is defining the industry requirements that will direct 5G’s eventual technical capabilities and provide the basis for all subsequent 5G standardization. How will the new 5G radio access technologies work? How will the 5G transition take place? What will Quality of Experience mean in a future in which communications technology is even more deeply embedded into the social fabric than it is today? This briefing provides insight into these questions, and covers some of the areas in which ATIS is working to ensure 5G’s success.