Which of the following is NOT a proper method to prevent falls when working at heights?

Relying solely on verbal communication is not a proper method to prevent falls when working at heights because verbal communication alone does not provide any physical safety measures. Fall prevention requires concrete safety equipment and systems that physically protect workers, such as harnesses, lanyards, and guardrails, which are designed to limit the risk of falling.

In a construction environment, effective communication is important, but it should be part of a comprehensive safety plan that includes tangible safety measures. While workers may need to communicate hazards or instructions verbally, this alone cannot substitute for the protective equipment and systems in place that are essential for ensuring safety at heights. Therefore, relying solely on verbal communication fails to provide the necessary protection against falls, making it an inadequate safety practice in this context.