Barrier Verification and Leading-Indicator Governance for High-Risk Technical Operations in Oil and Gas and Construction Projects: An Integrative Review

High-risk technical operations in oil and gas facilities and construction projects remain difficult to control because work is temporary, interfaces are fragmented, hazardous energy is frequently introduced or released, and schedule pressure can weaken otherwise mature safety systems. This review examines how safety interventions can be configured so that engineered barriers, work-control verification, competence assurance, contractor governance and leading indicators operate as a connected assurance system rather than as isolated programs. A structured integrative review of peer-reviewed literature published from 2020 to 2025 was undertaken, with emphasis on construction safety, oil and gas safety climate, proactive indicators, digital work controls and sociotechnical risk management. The evidence shows that personal-safety programs are valuable for routine exposure reduction, but they do not by themselves provide credible assurance against low-frequency, high-consequence events. Stronger intervention logic emerges when the control selected is matched to the failure mode: physical barriers for hazardous energy, verified permits and isolations for temporary configuration change, competence controls for judgement-intensive tasks, disclosure mechanisms for weak signals, and governance controls for contractor and schedule interfaces. Leading indicators are most useful when they measure the condition of these controls rather than the volume of safety activity. The review develops an integrated assurance framework and proposes practical indicator families for project and operational settings. The central conclusion is that intervention quality depends less on the number of safety initiatives than on whether each critical control is owned, independently verifiable, time-sensitive and connected to decision authority before exposure escalates.