The Singapore government enterprise architecture is a blueprint that will provide a holistic view of business functions, supporting data standards, and IT systems and services, regardless of the organisational structure and ownership of these functions and systems. The blueprint will also enable analysis of IT investments and their alignment to business functions, as well as facilitate collaboration among government agencies. When implemented, the Singapore government enterprise architecture will help bring about transformation in public sector by yielding optimised end-to-end business processes and system capabilities in alignment with government enterprise needs and missions. This chapter presents the considerations and approach taken to develop the Singapore government enterprise architecture. It examines the linkages of enterprise architecture with other initiatives such as the e-government action plans, policies, and processes related to IT governance, as well as summaries of lessons learned.