This guide examines why healthcare AI systems that perform well in pilots often fail to scale in real-world settings. Moving beyond model accuracy and technical performance, it explores the systemic, operational, and human factors that determine whether AI can be sustained within everyday clinical and organisational workflows. Drawing on recurring patterns observed across deployments, the guide outlines ten core reasons why AI initiatives stall between pilot success and real-world integration. These include infrastructure gaps, data fragmentation, workflow misalignment, unclear ownership, delayed governance, compliance design challenges, and economic constraints. Each is presented not as an isolated issue, but as part of an interconnected system where technology, people, processes, and incentives shape outcomes collectively. The guide introduces the concept of the “pilot–scale gap,” highlighting how controlled environments differ fundamentally from operational healthcare systems, where variability, time pressure, and institutional complexity define success. It emphasises that scaling is not an extension of pilots, but a redesign challenge requiring alignment across workflows, governance, accountability, and long-term system ownership. Designed for clinicians, healthcare leaders, product teams, policymakers, and researchers, this resource provides a practical lens to understand why AI fails to scale and what conditions are necessary to embed it reliably into healthcare systems. Part of the HealthInnovation Toolbox Innovation Series, it aims to support more responsible, sustainable, and system-aware adoption of AI in healthcare.
Sonu et al. (2026) studied this question.