Innovation or reinvention? : a systematic and bibliometric review of public sector digital infrastructure

Digital Public Infrastructure (DPI) has emerged as a foundational enabler of modern digital governance, yet scholarly understanding of its scope, design, and impact remains fragmented. This study addresses this gap by conducting a comprehensive systematic review and bibliometric analysis of 1153 scholarly and grey literature sources published between 1998 and April 2025. Our dual-method approach traces the conceptual evolution of DPI, maps key thematic trajectories, and critically examines whether DPI constitutes a genuine innovation or a reconfiguration of prior digital government paradigms. The analysis reveals a predominant focus on exploratory and practice-oriented studies, with limited empirical and longitudinal research. Notably, current framings position DPI in techno-solutionist terms, while overlooking crucial socio-technical elements, including legal and institutional infrastructures, digital readiness, and regional interoperability. In response to these gaps, we propose a more nuanced and multidimensional definition of DPI that integrates overlooked non-technical components. We further posit that DPI should not be reduced to technical artefacts but recognised as a dynamic socio-technical construct with profound implications for inclusivity, public value, and sustainable digital transformation. Our findings contribute to clarifying the conceptual boundaries of DPI and advancing a more grounded understanding that can inform both academic research and institutional practice. We conclude with a forward-looking research agenda, calling for interdisciplinary research, participatory policy design, and context-sensitive evaluation frameworks for DPI implementation.