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The hierarchy of controls prioritizes elimination, substitution, engineering, administrative, and finally PPE. Persistent injuries despite PPE and training indicate that lower-level controls are insufficient. Engineering controls that physically separate or guard the hazard are preferred. Guarded, interlocked cutting devices reduce contact opportunity and do not rely on consistent behavior, making them more reliable than administrative or PPE measures alone. Reinforcing policy and training (B) and discipline (C) are administrative controls subject to human error and fatigue; they may support but rarely solve persistent injury patterns. Upgrading PPE (D) may reduce severity but still permits exposure and may introduce dexterity issues. STS objectives require supervisors to analyze incident trends, perform task observations, and recommend higher-order controls to achieve sustainable risk reduction. Implementing guards or interlocks also demands change management: involving operators in design, ensuring maintainability, and verifying that no new hazards (e.g., bypassing interlocks) are introduced. Post-implementation monitoring and leading indicators (first-aid cases, near misses) help validate effectiveness.