Hierarchy of Controls Implementation Guide (ANSI Z10 Aligned)

The Hierarchy of Controls (HoC) is a foundational risk mitigation principle in occupational safety, codified in ANSI/ASSP Z10-2019 Section 8.2 (Hazard Identification, Risk Assessment, and Determination of Controls). This implementation guide translates the HoC into actionable steps integrated within Z10’s systemic PDCA cycle—ensuring hazard controls are not isolated interventions but embedded components of an organization’s broader safety management system (SMS). It emphasizes evidence-based decision-making: hazard identification must precede risk assessment (using qualitative, semi-quantitative, or quantitative methods), and control selection must be validated through effectiveness evaluation, worker participation, and documentation per Z10’s requirements for competence, awareness, and communication. Crucially, the guide mandates that higher-order controls (e.g., elimination) be pursued before resorting to lower-order ones (e.g., PPE), and requires justification—including documented rationale and residual risk analysis—whenever engineering or administrative controls are selected over elimination or substitution. Implementation also includes verification activities (e.g., inspection, monitoring, incident investigation linkage) and periodic review to ensure controls remain effective amid process changes, new hazards, or performance gaps—fully supporting Z10’s continual improvement mandate in Section 10.