Supervision of business activities through an inspections system is a key component of a government's regulatory apparatus. Several jurisdictions have attempted to address these challenges by further standardizing the approaches, resources, practices, and tools used by two or more inspectorates, a process also known as integration. This note offers insights for reformers and practitioners based on lessons from selected case studies, with a focus on in-land inspections systems integrated in the past decade and discusses some recent developments in inspection reform. A previous World Bank Group (WBG) publication identified five integration models. This study, while confirming that these models remain relevant, examines integration efforts using the five key areas of inspection reform as a lens: institutional frameworks, legal instruments, strategy planning and operational tools, competences, and e-Inspections.