This chapter explains the direction of digital IT such as cloud/mobile IT, big data, Internet of Things and artificial intelligence. This chapter introduces and briefs EA frameworks such as TOGAF, FEAF, DoDAF, MODAF, adaptive EA and EA3 Cube Framework and analyzes the selected EA frameworks from standpoints of cloud/mobile IT integration, as well. Furthermore, this chapter briefs Agile Enterprise Architecture, Design Thinking Approach and introduces the primary Scaling Agile frameworks and compares them. In the latter of this chapter, we investigated problems in digital transformation and related Enterprise Architecture, and we show solutions to cope with these problems in digital transformation and Enterprise Architecture. In later chapters, we will show the Strategic Architecture framework aligned with digital IT strategies covering AI digital platforms on the basis of the above solutions.