DPI is an approach to digitalization focused on creating "foundational, digital building blocks designed for the public benefit." By providing essential digital functions at society scale that can be reused across sectors, DPIs enable public and private service providers to build on these systems, innovate, and roll out new services more quickly and efficiently. Common systems built as DPIs include digital identity and electronic signatures, digital payments, and data sharing. However, to provide DPI functionality, these systems must embed principles such as inclusion, openness, modularity, inclusivity, user-centricity, privacy-by-design, and strong governance. This paper provides a common framework and primer on DPI for policymakers, practitioners, WBG staff, and the broader development community, including: • DPI Concepts and Theory of Change: This includes a working definition of DPI and its core characteristics, including the role of the private sector, how DPI differs from past approaches to digitalization, and the relationship between core DPI systems, sector-specific systems, other digital technologies, and broader ecosystem enablers and safeguards. The paper also articulates the potential benefits of DPI across a range of public and private sector services, as well as risks and challenges for implementation and adoption. • Considerations for Implementation: Drawing on the experiences of a diverse set of countries across different regions, income levels, and DPI approaches, the paper identifies common trends for building, scaling, and using DPIs that are safe and inclusive. This includes identifying what we know (and do not yet know) around different DPI design choices and models, implementation strategies, procurement, issues around use case integration and sequencing of DPI, and more. • Principles and Practical Lessons: Finally, it summarizes key lessons from countries' experiences with DPI to date, highlighting critical success factors and risk mitigation strategies for policymakers, practitioners, and development partners. A separate volume provides examples of DPI from countries around the globe. By leveraging the opportunities presented by DPI, countries can accelerate their digital transformation journeys and achieve more inclusive and sustainable development. The World Bank Group is committed to supporting this crucial endeavor. The WBG's new Global DPI Program will address key knowledge gaps and support countries in building safe, inclusive, and transformative DPI
