Most existing lifejacket donning instructions are logically sequenced but visually insufficient for rapid, error-free use by untrained individuals. The most critical improvements are explicit tightening guidance, mandatory crotch strap emphasis, and clear jacket orientation cues. Video briefings outperform static instructions; where only printed materials are possible, redesign with human error patterns in mind will measurably improve survival outcomes.
Record time for each sub-task (unfolding, slipping on, buckling) [6, 23]. eval lifejacket donning instructions
: Use a diverse group of test subjects (varying height, weight, and gender) rather than a "pool" of professional volunteers to avoid "familiarity bias" [7, 23]. Environment Record time for each sub-task (unfolding, slipping on,
—focuses on whether a user can correctly secure the jacket in under one minute without prior help. International Maritime Organization International Maritime Organization The ultimate test of a
The ultimate test of a lifejacket is the "face-up" test with an unconscious wearer.
Conversely, poor instructions commit the sin of . Many lifejacket tags are small, laminated rectangles covered in ten-step instructions, tiny diagrams, and warnings about “non-reversible oral inflation tubes” or “saltwater-activated lights.” In a simulated cold-water immersion test conducted by the RNLI, 40% of participants who read such instructions made at least one critical error: attempting to inflate the jacket before securing it (causing it to ride up and obstruct breathing), crossing the waist straps incorrectly, or fumbling for a crotch strap they did not know existed. The fatal flaw is that these instructions are written for inspection, not action. They assume the user has time to read, comprehend, and execute—a luxury that vanishes the moment cold water hits the face.