A. Measure undermining and tunneling separately and record them individually. Undermining and tunneling are separate, distinct characteristics of a wound that indicate the extent of tissue destruction under the wound edges. They must be measured individually at their deepest/widest point (using the clock face method to note their location) and recorded separately from the wound's overall length, width, and depth. This provides the most accurate assessment of the wound's progression or regression. B. Include undermining and tunneling measurements within the wound's depth. Undermining and tunneling are measured horizontally under the wound edges (undermining) or in a specific direction away from the wound bed (tunneling). They are separate from the maximum vertical depth of the visible wound bed itself. Combining them would lead to an inaccurate measurement of the wound's true depth and extent. C. Use a ruler to measure only the wound's length and width. While length and width are essential, failing to measure and record the depth, undermining, and tunneling in a complex wound like a pressure injury would result in an incomplete and insufficient assessment of tissue damage. D. Estimate the measurements visually. Accurate wound management requires precise, objective measurements to monitor healing progress. Visual estimation is subjective and prone to significant error, which can compromise treatment decisions.