Which of the following is NOT a method to assess the weight of a load to be hoisted?

Using visual estimation to assess the weight of a load is not a reliable method and can lead to significant inaccuracies. Unlike the other methods, which involve systematic approaches to determining weight, visual estimation is subject to personal judgment and can vary greatly depending on the observer's experience and perception.

In contrast, calculating the weight can be based on known dimensions, materials, and physics principles, providing a precise figure. The weight marked on an item is often mandated for safety and handling purposes, ensuring that operators have access to accurate weight information. Delivery dockets or weighbridge certificates offer verifiable data from credible sources, making them trustworthy for understanding the load's weight before hoisting. Thus, they are more effective and safer methods of assessment compared to merely estimating by sight.