BBC Article "The Japanese Skill Copied by the World"
The Japanese call it shisa kanko (literally ‘checking and calling’), an error-prevention drill that railway employees here have been using for more than 100 years. Conductors point at the things they need to check and then name them out loud as they do them, a dialogue with themselves to ensure nothing gets overlooked.
And it seems to work. A 1994 study by Japan’s Railway Technical Research Institute, cited in The Japan Times, showed that when asked to perform a simple task workers typically make 2.38 mistakes per 100 actions. When using shisa kanko, this number reduced to just 0.38% – a massive 85% drop.